diff --git a/build.gradle b/build.gradle
index db3ebcf1..05c9215d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,10 +18,19 @@ repositories {
 }
 
 dependencies {
+	// Spring Boot 핵심
 	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-jdbc'
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+
+	implementation 'org.springframework.boot:spring-boot-starter'
+	runtimeOnly 'com.mysql:mysql-connector-j'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
-	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+	compileOnly 'org.projectlombok:lombok:1.18.32'
+	annotationProcessor 'org.projectlombok:lombok:1.18.32'
+
 }
 
 tasks.named('test') {
diff --git a/src/main/java/com/example/bcsd/HelloController.java b/src/main/java/com/example/bcsd/HelloController.java
deleted file mode 100644
index 9559e2f1..00000000
--- a/src/main/java/com/example/bcsd/HelloController.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.example.bcsd;
-
-import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.ResponseBody;
-
-@Controller
-public class HelloController {
-
-    @ResponseBody
-    @GetMapping("/hello")
-    public String hello() {
-        return "Hello World!!!!!";
-    }
-
-    @GetMapping("/hello2")
-    public String hello2() {
-        return "hello";
-    }
-}
diff --git a/src/main/java/com/example/bcsd/controllers/ArticleController.java b/src/main/java/com/example/bcsd/controllers/ArticleController.java
new file mode 100644
index 00000000..808d6424
--- /dev/null
+++ b/src/main/java/com/example/bcsd/controllers/ArticleController.java
@@ -0,0 +1,48 @@
+package com.example.bcsd.controllers;
+
+import com.example.bcsd.models.Article;
+import com.example.bcsd.services.PostService;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/articles")
+public class ArticleController {
+
+    private final PostService postService;
+
+    public ArticleController(PostService postService) {
+        this.postService = postService;
+    }
+
+    @GetMapping
+    public List<Article> getArticlesByBoard(@RequestParam("boardId") int boardId) {
+        return postService.getArticlesByBoard(boardId);
+    }
+
+    @GetMapping("/{id}")
+    public Article getArticle(@PathVariable int id) {
+        return postService.getArticleById(id);
+    }
+
+    @PostMapping
+    public ResponseEntity<Void> createArticle(@RequestBody Article article) {
+        postService.createArticle(article);
+        return ResponseEntity.status(HttpStatus.CREATED).build();
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<Void> updateArticle(@PathVariable int id, @RequestBody Article article) {
+        postService.updateArticle(id, article);
+        return ResponseEntity.ok().build();
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> deleteArticle(@PathVariable int id) {
+        postService.deleteArticle(id);
+        return ResponseEntity.noContent().build();
+    }
+}
diff --git a/src/main/java/com/example/bcsd/controllers/MemberController.java b/src/main/java/com/example/bcsd/controllers/MemberController.java
new file mode 100644
index 00000000..187a3736
--- /dev/null
+++ b/src/main/java/com/example/bcsd/controllers/MemberController.java
@@ -0,0 +1,50 @@
+package com.example.bcsd.controllers;
+
+import com.example.bcsd.models.Member;
+import com.example.bcsd.services.MemberService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/members")
+public class MemberController {
+
+    private final MemberService memberService;
+
+    @Autowired
+    public MemberController(MemberService memberService) {
+        this.memberService = memberService;
+    }
+
+    @PostMapping
+    public ResponseEntity<Member> createMember(@RequestBody Member member) {
+        Member created = memberService.createMember(member);
+        return ResponseEntity.status(HttpStatus.CREATED).body(created);
+    }
+
+    @GetMapping("/{id}")
+    public ResponseEntity<Member> getMemberById(@PathVariable int id) {
+        return ResponseEntity.ok(memberService.getMemberById(id));
+    }
+
+    @GetMapping
+    public ResponseEntity<List<Member>> getAllMembers() {
+        return ResponseEntity.ok(memberService.getAllMembers());
+    }
+
+    @PutMapping("/{id}")
+    public ResponseEntity<Void> updateMember(@PathVariable int id, @RequestBody Member member) {
+        memberService.updateMember(id, member);
+        return ResponseEntity.ok().build();
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> deleteMember(@PathVariable int id) {
+        memberService.deleteMember(id);
+        return ResponseEntity.noContent().build();
+    }
+}
diff --git a/src/main/java/com/example/bcsd/controllers/PostController.java b/src/main/java/com/example/bcsd/controllers/PostController.java
new file mode 100644
index 00000000..3fb4f76a
--- /dev/null
+++ b/src/main/java/com/example/bcsd/controllers/PostController.java
@@ -0,0 +1,26 @@
+package com.example.bcsd.controllers;
+
+import com.example.bcsd.services.PostService;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+
+
+@Controller
+public class PostController {
+    private final PostService postService;
+
+    public PostController(PostService postService) {
+        this.postService = postService;
+    }
+
+    @GetMapping("/posts")
+    public String getPosts(@RequestParam int boardId, Model model) {
+        model.addAttribute("boardName", postService.getBoardName(boardId));
+        model.addAttribute("articles", postService.getArticlesByBoard(boardId));
+        return "posts";
+    }
+}
+
diff --git a/src/main/java/com/example/bcsd/controllers/SessionController.java b/src/main/java/com/example/bcsd/controllers/SessionController.java
new file mode 100644
index 00000000..9d941c2f
--- /dev/null
+++ b/src/main/java/com/example/bcsd/controllers/SessionController.java
@@ -0,0 +1,63 @@
+package com.example.bcsd.controllers;
+
+import com.example.bcsd.dtos.LoginDto;
+import com.example.bcsd.dtos.SignupDto;
+import com.example.bcsd.models.Member;
+import com.example.bcsd.repositories.MemberRepository;
+import jakarta.servlet.http.HttpSession;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.Optional;
+
+@Controller
+@RequiredArgsConstructor
+public class SessionController {
+
+    private final MemberRepository memberRepository;
+
+    @GetMapping("/login")
+    public String loginForm() {
+        return "login";
+    }
+    @GetMapping("/signup")
+    public String signupForm() {
+        return "signup"; // templates/login.html 파일 필요
+    }
+
+    @PostMapping("/signup")
+    public String signup(SignupDto request) {
+        if (!request.getPassword().equals(request.getConfirmPassword())) {
+            return "비밀번호가 일치하지 않습니다.";
+        }
+
+        if (memberRepository.findByAccount(request.getAccount()).isPresent()) {
+            return "이미 존재하는 계정입니다.";
+        }
+
+        Member member = new Member();
+        member.setAccount(request.getAccount());
+        member.setPassword(request.getPassword());
+        member.setEmail(request.getEmail());
+        member.setName(request.getName());
+        memberRepository.save(member);
+
+        return "redirect:/login";
+    }
+
+    @PostMapping("/login")
+    public String login(LoginDto request, HttpSession session) {
+        Optional<Member> optionalMember = memberRepository.findByAccount(request.getAccount());
+
+        if (optionalMember.isEmpty()) return "존재하지 않는 계정입니다.";
+        Member member = optionalMember.get();
+
+        if (!member.getPassword().equals(request.getPassword())) {
+            return "비밀번호가 틀렸습니다.";
+        }
+
+        session.setAttribute("loginMember", member); // 세션 저장
+        return "redirect:/";
+    }
+}
diff --git a/src/main/java/com/example/bcsd/daos/ArticleDAO.java b/src/main/java/com/example/bcsd/daos/ArticleDAO.java
new file mode 100644
index 00000000..0099c200
--- /dev/null
+++ b/src/main/java/com/example/bcsd/daos/ArticleDAO.java
@@ -0,0 +1,54 @@
+/*package com.example.bcsd.daos;
+
+import com.example.bcsd.models.Article;
+import org.springframework.stereotype.Repository;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+
+import java.util.List;
+
+@Repository
+public class ArticleDAO {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    public Article findById(int id) {
+        return em.find(Article.class, id);
+    }
+
+    public List<Article> findByBoardId(int boardId) {
+        return em.createQuery("SELECT a FROM Article a WHERE a.boardId = :boardId", Article.class)
+                .setParameter("boardId", boardId)
+                .getResultList();
+    }
+
+    public void insert(Article article) {
+        em.persist(article);
+    }
+
+    public void update(int id, Article article) {
+        Article target = em.find(Article.class, id);
+        if (target != null) {
+            target.setBoardId(article.getBoardId());
+            target.setTitle(article.getTitle());
+            target.setContent(article.getContent());
+            target.setUpdatedAt(java.time.LocalDateTime.now());
+        }
+    }
+
+    public void delete(int id) {
+        Article article = em.find(Article.class, id);
+        if (article != null) {
+            em.remove(article);
+        }
+    }
+
+    public int countByAuthorId(int authorId) {
+        Long count = em.createQuery("SELECT COUNT(a) FROM Article a WHERE a.authorId = :authorId", Long.class)
+                .setParameter("authorId", authorId)
+                .getSingleResult();
+        return count.intValue();
+    }
+}
+*/
diff --git a/src/main/java/com/example/bcsd/daos/BoardDAO.java b/src/main/java/com/example/bcsd/daos/BoardDAO.java
new file mode 100644
index 00000000..a3e6417d
--- /dev/null
+++ b/src/main/java/com/example/bcsd/daos/BoardDAO.java
@@ -0,0 +1,30 @@
+/*
+package com.example.bcsd.daos;
+
+
+import com.example.bcsd.models.Board;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.dao.EmptyResultDataAccessException;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowMapper;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+
+@Repository
+public class BoardDAO {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    public Optional<String> findNameById(int id) {
+        List<String> names = em.createQuery("SELECT b.name FROM Board b WHERE b.id = :id", String.class)
+                .setParameter("id", id)
+                .getResultList();
+        return names.stream().findFirst();
+    }
+}
+*/
diff --git a/src/main/java/com/example/bcsd/daos/MemberDAO.java b/src/main/java/com/example/bcsd/daos/MemberDAO.java
new file mode 100644
index 00000000..87746fe5
--- /dev/null
+++ b/src/main/java/com/example/bcsd/daos/MemberDAO.java
@@ -0,0 +1,51 @@
+/*
+package com.example.bcsd.daos;
+
+import com.example.bcsd.models.Member;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.Optional;
+
+@Repository
+public class MemberDAO {
+
+    @PersistenceContext
+    private EntityManager em;
+
+    public Member findById(int id) {
+        return em.find(Member.class, id);
+    }
+
+    public List<Member> findAll() {
+        return em.createQuery("SELECT m FROM Member m", Member.class).getResultList();
+    }
+
+    public void insert(Member member) {
+        em.persist(member);
+    }
+
+    public void update(Member member) {
+        Member target = em.find(Member.class, member.getId());
+        if (target != null) {
+            target.setName(member.getName());
+            target.setEmail(member.getEmail());
+        }
+    }
+
+    public void delete(int id) {
+        Member member = em.find(Member.class, id);
+        if (member != null) {
+            em.remove(member);
+        }
+    }
+    public Optional<Member> findByEmail(String email) {
+        List<Member> result = em.createQuery("SELECT m FROM Member m WHERE m.email = :email", Member.class)
+                .setParameter("email", email)
+                .getResultList();
+        return result.stream().findFirst();
+    }
+}
+ */
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/dtos/LoginDto.java b/src/main/java/com/example/bcsd/dtos/LoginDto.java
new file mode 100644
index 00000000..26275b41
--- /dev/null
+++ b/src/main/java/com/example/bcsd/dtos/LoginDto.java
@@ -0,0 +1,10 @@
+package com.example.bcsd.dtos;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter @Setter
+public class LoginDto {
+    private String account;
+    private String password;
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/dtos/SignupDto.java b/src/main/java/com/example/bcsd/dtos/SignupDto.java
new file mode 100644
index 00000000..d2035ee2
--- /dev/null
+++ b/src/main/java/com/example/bcsd/dtos/SignupDto.java
@@ -0,0 +1,13 @@
+package com.example.bcsd.dtos;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter @Setter
+public class SignupDto {
+    private String account;
+    private String password;
+    private String confirmPassword;
+    private String email;
+    private String name;
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/exceptions/DataConflictException.java b/src/main/java/com/example/bcsd/exceptions/DataConflictException.java
new file mode 100644
index 00000000..9b526837
--- /dev/null
+++ b/src/main/java/com/example/bcsd/exceptions/DataConflictException.java
@@ -0,0 +1,7 @@
+package com.example.bcsd.exceptions;
+
+public class DataConflictException extends RuntimeException {
+    public DataConflictException(String message) {
+        super(message);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/exceptions/GlobalExceptionHandler.java b/src/main/java/com/example/bcsd/exceptions/GlobalExceptionHandler.java
new file mode 100644
index 00000000..84942b65
--- /dev/null
+++ b/src/main/java/com/example/bcsd/exceptions/GlobalExceptionHandler.java
@@ -0,0 +1,29 @@
+package com.example.bcsd.exceptions;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(ResourceNotFoundException.class)
+    public ResponseEntity<String> handleNotFound(ResourceNotFoundException ex) {
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ex.getMessage());
+    }
+
+    @ExceptionHandler(DataConflictException.class)
+    public ResponseEntity<String> handleConflict(DataConflictException ex) {
+        return ResponseEntity.status(HttpStatus.CONFLICT).body(ex.getMessage());
+    }
+
+    @ExceptionHandler(InvalidRequestException.class)
+    public ResponseEntity<String> handleBadRequest(InvalidRequestException ex) {
+        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(ex.getMessage());
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<String> handleOther(Exception ex) {
+        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
+                .body("서버 오류: " + ex.getMessage());
+    }
+}
diff --git a/src/main/java/com/example/bcsd/exceptions/InvalidRequestException.java b/src/main/java/com/example/bcsd/exceptions/InvalidRequestException.java
new file mode 100644
index 00000000..2f157af1
--- /dev/null
+++ b/src/main/java/com/example/bcsd/exceptions/InvalidRequestException.java
@@ -0,0 +1,7 @@
+package com.example.bcsd.exceptions;
+
+public class InvalidRequestException extends RuntimeException {
+    public InvalidRequestException(String message) {
+        super(message);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/exceptions/ResourceNotFoundException.java b/src/main/java/com/example/bcsd/exceptions/ResourceNotFoundException.java
new file mode 100644
index 00000000..c2106f33
--- /dev/null
+++ b/src/main/java/com/example/bcsd/exceptions/ResourceNotFoundException.java
@@ -0,0 +1,7 @@
+package com.example.bcsd.exceptions;
+
+public class ResourceNotFoundException extends RuntimeException{
+    public ResourceNotFoundException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/com/example/bcsd/models/Article.java b/src/main/java/com/example/bcsd/models/Article.java
new file mode 100644
index 00000000..ef31f43f
--- /dev/null
+++ b/src/main/java/com/example/bcsd/models/Article.java
@@ -0,0 +1,86 @@
+package com.example.bcsd.models;
+
+import jakarta.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+public class Article {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "author_id")
+    private Member author;
+
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "board_id")
+    private Board board;
+
+    private String title;
+    private String content;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    public Article() {
+        this.createdAt = LocalDateTime.now();
+        this.updatedAt = LocalDateTime.now();
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public Member getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(Member author) {
+        this.author = author;
+    }
+
+    public Board getBoard() {
+        return board;
+    }
+
+    public void setBoard(Board board) {
+        this.board = board;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/models/Board.java b/src/main/java/com/example/bcsd/models/Board.java
new file mode 100644
index 00000000..8bc3738d
--- /dev/null
+++ b/src/main/java/com/example/bcsd/models/Board.java
@@ -0,0 +1,61 @@
+package com.example.bcsd.models;
+
+import jakarta.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+
+public class Board {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+    private String name;
+
+    @OneToMany(mappedBy = "board", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.LAZY)
+    private List<Article> articles = new ArrayList<>();
+    public Board() {
+
+    }
+
+    public Board(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public void addArticle(Article article) {
+        articles.add(article);
+        article.setBoard(this);
+    }
+
+    public void removeArticle(Article article) {
+        articles.remove(article);
+        article.setBoard(null);
+    }
+
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<Article> getArticles() {
+        return articles;
+    }
+
+    public void setArticles(List<Article> articles) {
+        this.articles = articles;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/models/Member.java b/src/main/java/com/example/bcsd/models/Member.java
new file mode 100644
index 00000000..481a2431
--- /dev/null
+++ b/src/main/java/com/example/bcsd/models/Member.java
@@ -0,0 +1,83 @@
+package com.example.bcsd.models;
+
+import jakarta.persistence.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+public class Member {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+    private String account;
+    private String name;
+    private String email;
+    private String password;
+
+    @OneToMany(mappedBy = "author", fetch = FetchType.LAZY)
+    private List<Article> articles = new ArrayList<>();
+
+    public Member(int id, String account, String name, String email, String password) {
+        this.id = id;
+        this.account = account;
+        this.name = name;
+        this.email = email;
+        this.password = password;
+    }
+
+    public Member() {
+
+    }
+
+    public String getAccount() {
+        return account;
+    }
+
+    public void setAccount(String account) {
+        this.account = account;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public List<Article> getArticles() {
+        return articles;
+    }
+
+    public void setArticles(List<Article> articles) {
+        this.articles = articles;
+    }
+
+
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/repositories/ArticleRepository.java b/src/main/java/com/example/bcsd/repositories/ArticleRepository.java
new file mode 100644
index 00000000..a7b78417
--- /dev/null
+++ b/src/main/java/com/example/bcsd/repositories/ArticleRepository.java
@@ -0,0 +1,15 @@
+package com.example.bcsd.repositories;
+
+import com.example.bcsd.models.Article;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface ArticleRepository extends JpaRepository<Article, Integer> {
+
+    List<Article> findByBoardId(int boardId);
+
+    long countByAuthorId(int authorId);
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/repositories/BoardRepository.java b/src/main/java/com/example/bcsd/repositories/BoardRepository.java
new file mode 100644
index 00000000..660637c3
--- /dev/null
+++ b/src/main/java/com/example/bcsd/repositories/BoardRepository.java
@@ -0,0 +1,9 @@
+package com.example.bcsd.repositories;
+
+import com.example.bcsd.models.Board;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface BoardRepository extends JpaRepository<Board, Integer> {
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/repositories/MemberRepository.java b/src/main/java/com/example/bcsd/repositories/MemberRepository.java
new file mode 100644
index 00000000..cf21287f
--- /dev/null
+++ b/src/main/java/com/example/bcsd/repositories/MemberRepository.java
@@ -0,0 +1,13 @@
+package com.example.bcsd.repositories;
+
+import com.example.bcsd.models.Member;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.Optional;
+
+@Repository
+public interface MemberRepository extends JpaRepository<Member, Integer> {
+    Optional<Member> findByEmail(String email);
+    Optional<Member> findByAccount(String account);
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/services/MemberService.java b/src/main/java/com/example/bcsd/services/MemberService.java
new file mode 100644
index 00000000..33ba8db3
--- /dev/null
+++ b/src/main/java/com/example/bcsd/services/MemberService.java
@@ -0,0 +1,93 @@
+package com.example.bcsd.services;
+
+import com.example.bcsd.exceptions.DataConflictException;
+import com.example.bcsd.exceptions.InvalidRequestException;
+import com.example.bcsd.exceptions.ResourceNotFoundException;
+import com.example.bcsd.models.Member;
+import com.example.bcsd.repositories.ArticleRepository;
+import com.example.bcsd.repositories.MemberRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class MemberService {
+
+    private final MemberRepository memberRepository;
+    private final ArticleRepository articleRepository;
+
+    @Autowired
+    public MemberService(MemberRepository memberRepository, ArticleRepository articleRepository) {
+        this.memberRepository = memberRepository;
+        this.articleRepository = articleRepository;
+    }
+
+    @Transactional
+    public Member createMember(Member member) {
+        if (member.getName() == null || member.getName().isBlank() ||
+                member.getEmail() == null || member.getEmail().isBlank() ||
+                member.getPassword() == null || member.getPassword().isBlank()) {
+            throw new InvalidRequestException("사용자 생성 요청 시 필수 값이 누락되었습니다. (name, email, password)");
+        }
+
+        memberRepository.findByEmail(member.getEmail()).ifPresent(m -> {
+            throw new DataConflictException("이미 사용 중인 이메일입니다: " + member.getEmail());
+        });
+
+        return memberRepository.save(member);
+    }
+
+    @Transactional(readOnly = true)
+    public Member getMemberById(int id) {
+        return memberRepository.findById(id)
+                .orElseThrow(() -> new ResourceNotFoundException("ID가 " + id + "인 사용자를 찾을 수 없습니다."));
+    }
+
+    @Transactional(readOnly = true)
+    public List<Member> getAllMembers() {
+        return memberRepository.findAll();
+    }
+
+    @Transactional
+    public void updateMember(int id, Member memberUpdateData) {
+        Member existingMember = getMemberById(id);
+
+        if (memberUpdateData.getName() != null && memberUpdateData.getName().isBlank()) {
+            throw new InvalidRequestException("사용자 이름은 비워둘 수 없습니다.");
+        }
+        if (memberUpdateData.getEmail() != null && memberUpdateData.getEmail().isBlank()) {
+            throw new InvalidRequestException("이메일은 비워둘 수 없습니다.");
+        }
+        if (memberUpdateData.getPassword() != null && memberUpdateData.getPassword().isBlank()) {
+            throw new InvalidRequestException("비밀번호는 비워둘 수 없습니다.");
+        }
+
+        if (memberUpdateData.getEmail() != null && !memberUpdateData.getEmail().equalsIgnoreCase(existingMember.getEmail())) {
+            Optional<Member> memberWithNewEmail = memberRepository.findByEmail(memberUpdateData.getEmail());
+            if (memberWithNewEmail.isPresent() && memberWithNewEmail.get().getId() != id) {
+                throw new DataConflictException("이미 다른 사용자가 사용 중인 이메일입니다: " + memberUpdateData.getEmail());
+            }
+            existingMember.setEmail(memberUpdateData.getEmail());
+        }
+
+        if (memberUpdateData.getName() != null && !memberUpdateData.getName().isBlank()) {
+            existingMember.setName(memberUpdateData.getName());
+        }
+        if (memberUpdateData.getPassword() != null && !memberUpdateData.getPassword().isBlank()) {
+            existingMember.setPassword(memberUpdateData.getPassword());
+        }
+    }
+
+    @Transactional
+    public void deleteMember(int id) {
+        getMemberById(id);
+
+        if (articleRepository.countByAuthorId(id) > 0) {
+            throw new InvalidRequestException("ID가 " + id + "인 사용자는 작성한 게시물이 있어 삭제할 수 없습니다.");
+        }
+        memberRepository.deleteById(id);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/bcsd/services/PostService.java b/src/main/java/com/example/bcsd/services/PostService.java
new file mode 100644
index 00000000..99e1d0a4
--- /dev/null
+++ b/src/main/java/com/example/bcsd/services/PostService.java
@@ -0,0 +1,101 @@
+package com.example.bcsd.services;
+
+import com.example.bcsd.exceptions.InvalidRequestException;
+import com.example.bcsd.exceptions.ResourceNotFoundException;
+import com.example.bcsd.models.Article;
+import com.example.bcsd.models.Board;
+import com.example.bcsd.models.Member;
+import com.example.bcsd.repositories.ArticleRepository;
+import com.example.bcsd.repositories.BoardRepository;
+import com.example.bcsd.repositories.MemberRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+public class PostService {
+    private final ArticleRepository articleRepository;
+    private final BoardRepository boardRepository;
+    private final MemberRepository memberRepository;
+
+    public PostService(ArticleRepository articleRepository, BoardRepository boardRepository, MemberRepository memberRepository) {
+        this.articleRepository = articleRepository;
+        this.boardRepository = boardRepository;
+        this.memberRepository = memberRepository;
+    }
+
+    @Transactional(readOnly = true)
+    public List<Article> getArticlesByBoard(int boardId) {
+        if (!boardRepository.existsById(boardId)) {
+            throw new ResourceNotFoundException("ID가 " + boardId + "인 게시판을 찾을 수 없습니다.");
+        }
+        return articleRepository.findByBoardId(boardId);
+    }
+
+    @Transactional(readOnly = true)
+    public String getBoardName(int boardId) {
+        return boardRepository.findById(boardId)
+                .map(Board::getName)
+                .orElseThrow(() -> new ResourceNotFoundException("ID가 " + boardId + "인 게시판을 찾을 수 없습니다."));
+    }
+
+    @Transactional(readOnly = true)
+    public Article getArticleById(int id) {
+        Article article = articleRepository.findById(id)
+                .orElseThrow(() -> new ResourceNotFoundException("ID가 " + id + "인 게시물을 찾을 수 없습니다."));
+        return article;
+    }
+
+    @Transactional
+    public void createArticle(Article article) {
+        if (article.getAuthor() == null || article.getAuthor().getId() == 0 ||
+                article.getBoard() == null || article.getBoard().getId() == 0 ||
+                article.getTitle() == null || article.getTitle().isBlank() ||
+                article.getContent() == null || article.getContent().isBlank()) {
+            throw new InvalidRequestException("게시물 생성 요청 시 필수 값이 누락되었습니다. (authorId, boardId, title, content)");
+        }
+
+        Member author = memberRepository.findById(article.getAuthor().getId())
+                .orElseThrow(() -> new InvalidRequestException("ID가 " + article.getAuthor().getId() + "인 사용자를 찾을 수 없습니다."));
+
+        Board board = boardRepository.findById(article.getBoard().getId())
+                .orElseThrow(() -> new InvalidRequestException("ID가 " + article.getBoard().getId() + "인 게시판을 찾을 수 없습니다."));
+
+        article.setAuthor(author);
+
+        board.addArticle(article);
+        boardRepository.save(board);
+    }
+
+    @Transactional
+    public void updateArticle(int id, Article articleUpdateData) {
+        Article existingArticle = getArticleById(id);
+
+        if (articleUpdateData.getTitle() != null) {
+            if (articleUpdateData.getTitle().isBlank()) {
+                throw new InvalidRequestException("게시물 제목은 비워둘 수 없습니다.");
+            }
+            existingArticle.setTitle(articleUpdateData.getTitle());
+        }
+
+        if (articleUpdateData.getContent() != null) {
+            if (articleUpdateData.getContent().isBlank()) {
+                throw new InvalidRequestException("게시물 내용은 비워둘 수 없습니다.");
+            }
+            existingArticle.setContent(articleUpdateData.getContent());
+        }
+        existingArticle.setUpdatedAt(java.time.LocalDateTime.now());
+    }
+
+    @Transactional
+    public void deleteArticle(int id) {
+        Article article = getArticleById(id);
+        Board board = article.getBoard();
+        if (board != null) {
+            board.getArticles().remove(article);
+        } else {
+            articleRepository.delete(article);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/resources/templates/login.html b/src/main/resources/templates/login.html
new file mode 100644
index 00000000..67ba52a6
--- /dev/null
+++ b/src/main/resources/templates/login.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+  <meta charset="UTF-8">
+  <title>Login Form</title>
+</head>
+<body>
+<h2>Login Form</h2>
+<form th:action="@{/login}" method="post">
+  <label for="account">Account:</label>
+  <input type="text" id="account" name="account" required><br><br>
+
+  <label for="password">Password:</label>
+  <input type="password" id="password" name="password" required><br><br>
+
+  <button type="submit">Login</button>
+</form>
+
+<p>Don't have an account? <a th:href="@{/signup}">Sign up here</a></p>
+</body>
+</html>
diff --git a/src/main/resources/templates/posts.html b/src/main/resources/templates/posts.html
new file mode 100644
index 00000000..948e69b2
--- /dev/null
+++ b/src/main/resources/templates/posts.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>Board Posts</title>
+</head>
+<body>
+<h1 th:text="'Board: ' + ${boardName}"></h1>
+<ul>
+    <li th:each="article : ${articles}">
+        <a th:href="@{'/articles/' + ${article.id}}" th:text="${article.title}"></a>
+    </li>
+</ul>
+</body>
+</html>
diff --git a/src/main/resources/templates/signup.html b/src/main/resources/templates/signup.html
new file mode 100644
index 00000000..ba538275
--- /dev/null
+++ b/src/main/resources/templates/signup.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+<head>
+  <meta charset="UTF-8">
+  <title>회원가입</title>
+</head>
+<body>
+<h2>회원가입</h2>
+<form th:action="@{/signup}" method="post">
+  <label for="account">아이디:</label>
+  <input type="text" id="account" name="account" required><br><br>
+
+  <label for="password">비밀번호:</label>
+  <input type="password" id="password" name="password" required><br><br>
+
+  <label for="confirmPassword">비밀번호 확인:</label>
+  <input type="password" id="confirmPassword" name="confirmPassword" required><br><br>
+
+  <label for="name">이름:</label>
+  <input type="text" id="name" name="name" required><br><br>
+
+  <label for="email">이메일:</label>
+  <input type="email" id="email" name="email" required><br><br>
+
+  <button type="submit">가입하기</button>
+</form>
+
+<p>이미 계정이 있으신가요? <a th:href="@{/login}">로그인</a></p>
+</body>
+</html>