diff --git a/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovException.java b/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovException.java
index 90d22b06..038eb65c 100755
--- a/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovException.java
+++ b/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovException.java
@@ -33,9 +33,9 @@
  */
 public class EgovException extends RuntimeException {
 
-    protected EgovErrorCode egovErrorCode;
+    private static final long serialVersionUID = 1L;
 
-    protected String message;
+    protected EgovErrorCode egovErrorCode;
 
     public EgovException(EgovErrorCode egovErrorCode) {
         this(egovErrorCode, true, null);
@@ -50,17 +50,12 @@ public EgovException(EgovErrorCode egovErrorCode, String message) {
     }
 
     public EgovException(EgovErrorCode egovErrorCode, boolean messageCode, String message) {
+        super(messageCode ? egovErrorCode.getMessage() : message);
         this.egovErrorCode = egovErrorCode;
-        if (messageCode) message = egovErrorCode.getMessage();
-        this.message = message;
     }
 
     public EgovErrorCode getEgovErrorCode() {
         return egovErrorCode;
     }
 
-    public String getMessage() {
-        return message;
-    }
-
 }
diff --git a/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovServiceException.java b/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovServiceException.java
index 8b67614c..10f3fe94 100755
--- a/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovServiceException.java
+++ b/Presentation/org.egovframe.rte.ptl.reactive/src/main/java/org/egovframe/rte/ptl/reactive/exception/EgovServiceException.java
@@ -33,25 +33,21 @@
  */
 public class EgovServiceException extends RuntimeException {
 
-    protected EgovErrorCode egovErrorCode;
+    private static final long serialVersionUID = 1L;
 
-    protected String message;
+    protected EgovErrorCode egovErrorCode;
 
     public EgovServiceException(String message) {
         this(EgovErrorCode.INTERNAL_SERVER_ERROR, message);
     }
 
     public EgovServiceException(EgovErrorCode egovErrorCode, String message) {
+        super(message);
         this.egovErrorCode = egovErrorCode;
-        this.message = message;
     }
 
     public EgovErrorCode getEgovErrorCode() {
         return egovErrorCode;
     }
 
-    public String getMessage() {
-        return message;
-    }
-
 }
diff --git a/Presentation/org.egovframe.rte.ptl.reactive/src/test/java/org/egovframe/rte/ptl/reactive/exception/EgovExceptionTest.java b/Presentation/org.egovframe.rte.ptl.reactive/src/test/java/org/egovframe/rte/ptl/reactive/exception/EgovExceptionTest.java
new file mode 100644
index 00000000..c87885ad
--- /dev/null
+++ b/Presentation/org.egovframe.rte.ptl.reactive/src/test/java/org/egovframe/rte/ptl/reactive/exception/EgovExceptionTest.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2008-2024 MOIS(Ministry of the Interior and Safety).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.egovframe.rte.ptl.reactive.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
+/**
+ * EgovException 단위 테스트
+ *
+ * <p>각 생성자의 getMessage() 반환값(동작 보존)과 Throwable 표준 메시지 전파(개선)를 검증한다.</p>
+ */
+public class EgovExceptionTest {
+
+    @Test
+    public void messageConstructor() {
+        EgovException ex = new EgovException("invalid");
+
+        assertEquals("invalid", ex.getMessage());
+        assertSame(EgovErrorCode.INVALID_INPUT_VALUE, ex.getEgovErrorCode());
+    }
+
+    @Test
+    public void errorCodeAndMessageConstructor() {
+        EgovException ex = new EgovException(EgovErrorCode.NOT_FOUND, "custom");
+
+        assertEquals("custom", ex.getMessage());
+        assertSame(EgovErrorCode.NOT_FOUND, ex.getEgovErrorCode());
+    }
+
+    @Test
+    public void errorCodeConstructorUsesErrorCodeMessage() {
+        EgovException ex = new EgovException(EgovErrorCode.NOT_FOUND);
+
+        assertEquals(EgovErrorCode.NOT_FOUND.getMessage(), ex.getMessage());
+        assertSame(EgovErrorCode.NOT_FOUND, ex.getEgovErrorCode());
+    }
+
+    @Test
+    public void messageIsPropagatedToThrowable() {
+        RuntimeException re = new EgovException(EgovErrorCode.NOT_FOUND, "custom");
+
+        // 수정 전에는 super(message)를 호출하지 않아 null 이었음(개선 입증)
+        assertEquals("custom", re.getMessage());
+    }
+
+}
diff --git a/Presentation/org.egovframe.rte.ptl.reactive/src/test/java/org/egovframe/rte/ptl/reactive/exception/EgovServiceExceptionTest.java b/Presentation/org.egovframe.rte.ptl.reactive/src/test/java/org/egovframe/rte/ptl/reactive/exception/EgovServiceExceptionTest.java
new file mode 100644
index 00000000..a68ae81c
--- /dev/null
+++ b/Presentation/org.egovframe.rte.ptl.reactive/src/test/java/org/egovframe/rte/ptl/reactive/exception/EgovServiceExceptionTest.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2008-2024 MOIS(Ministry of the Interior and Safety).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.egovframe.rte.ptl.reactive.exception;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
+/**
+ * EgovServiceException 단위 테스트
+ *
+ * <p>각 생성자의 getMessage() 반환값(동작 보존)과 Throwable 표준 메시지 전파(개선)를 검증한다.</p>
+ */
+public class EgovServiceExceptionTest {
+
+    @Test
+    public void messageConstructor() {
+        EgovServiceException ex = new EgovServiceException("failed");
+
+        assertEquals("failed", ex.getMessage());
+        assertSame(EgovErrorCode.INTERNAL_SERVER_ERROR, ex.getEgovErrorCode());
+    }
+
+    @Test
+    public void errorCodeAndMessageConstructor() {
+        EgovServiceException ex = new EgovServiceException(EgovErrorCode.SERVICE_UNAVAILABLE, "failed");
+
+        assertEquals("failed", ex.getMessage());
+        assertSame(EgovErrorCode.SERVICE_UNAVAILABLE, ex.getEgovErrorCode());
+    }
+
+    @Test
+    public void messageIsPropagatedToThrowable() {
+        RuntimeException re = new EgovServiceException(EgovErrorCode.SERVICE_UNAVAILABLE, "failed");
+
+        // 수정 전에는 super(message)를 호출하지 않아 null 이었음(개선 입증)
+        assertEquals("failed", re.getMessage());
+    }
+
+}