diff --git a/default/src/main/java/org/dfbf/soundlink/domain/alert/service/AlertService.java b/default/src/main/java/org/dfbf/soundlink/domain/alert/service/AlertService.java
index a0c6bc61..6e4c3d8b 100644
--- a/default/src/main/java/org/dfbf/soundlink/domain/alert/service/AlertService.java
+++ b/default/src/main/java/org/dfbf/soundlink/domain/alert/service/AlertService.java
@@ -114,4 +114,9 @@ public void disconnectAlarm(Long userId) {
         alertRepository.delete(userId, emitterId);
         sseEmitter.complete();
     }
+
+    // 사용자가 온라인인지 오프라인인지 확인 (Use UserId)
+    public boolean isOnline(Long userId) {
+        return alertRepository.getEmitterId(userId).isPresent();
+    }
 }
\ No newline at end of file
diff --git a/default/src/main/java/org/dfbf/soundlink/domain/chat/service/ChatRoomService.java b/default/src/main/java/org/dfbf/soundlink/domain/chat/service/ChatRoomService.java
index 4f33b314..9bd5d3be 100644
--- a/default/src/main/java/org/dfbf/soundlink/domain/chat/service/ChatRoomService.java
+++ b/default/src/main/java/org/dfbf/soundlink/domain/chat/service/ChatRoomService.java
@@ -64,6 +64,11 @@ public ResponseResult saveRequestToRedis(Long requestUserId, Long emotionRecordI
                     .getUser()
                     .getUserId();
 
+            // 사용자가 오프라인이면 202 보내고 종료
+            if (!alertService.isOnline(responseUserId)) {
+                return new ResponseResult(ErrorCode.CHAT_REQUEST_SSE_FAILED, "Request is not sent.");
+            }
+
             // 요청자와 응답자가 같은 경우
             if (requestUserId.equals(responseUserId)) {
                 return new ResponseResult(400, "You can't chat with yourself.");
diff --git a/default/src/test/java/org/dfbf/soundlink/domain/chatRoom/ChatRoomServiceTest.java b/default/src/test/java/org/dfbf/soundlink/domain/chatRoom/ChatRoomServiceTest.java
index 2a9424cd..f970d58f 100644
--- a/default/src/test/java/org/dfbf/soundlink/domain/chatRoom/ChatRoomServiceTest.java
+++ b/default/src/test/java/org/dfbf/soundlink/domain/chatRoom/ChatRoomServiceTest.java
@@ -120,6 +120,7 @@ void setUp() {
     @Test
     @DisplayName("채팅 요청: Redis에 저장 성공")
     void testSaveRequestToRedis_SUCCESS() {
+
         // given
         when(emotionRecordRepository.findById(emotionRecordId)).thenReturn(Optional.of(emotionRecord));  // 감정 기록 조회
         when(userRepository.findByUserIdWithCache(requestUserId)).thenReturn(Optional.of(requestUser));  // 요청자 정보 조회
@@ -130,6 +131,9 @@ void testSaveRequestToRedis_SUCCESS() {
 //        when(alertService.send(eq(responseUserId), eq("alarm"), any(Alert.class)))
 //                .thenReturn(new ResponseResult(ErrorCode.SUCCESS));  // 알림 전송 mock
 
+        // 상대방이 온라인이라고 가정..
+        when(alertService.isOnline(responseUserId)).thenReturn(true);
+
         // Redis 관련 mock 설정
         ValueOperations<String, Object> valueOps = mock(ValueOperations.class);  // ValueOperations 객체 생성
         when(redisTemplate.opsForValue()).thenReturn(valueOps);  // redisTemplate에서 valueOps 반환하도록 설정
@@ -171,6 +175,20 @@ void testDeleteRequestFromRedis_SUCCESS() {
         verify(alertService).send(responseUserId, "cancel", "Chat request has been canceled.");
     }
 
+    @Test
+    @DisplayName("상대방이 오프라인일 경우")
+    void testSaveRequestToRedis_Offline() {
+        // given
+        when(emotionRecordRepository.findById(emotionRecordId)).thenReturn(Optional.of(emotionRecord));
+        when(alertService.isOnline(responseUserId)).thenReturn(false); // 핵심만 남김
+
+        // when
+        ResponseResult result = chatRoomService.saveRequestToRedis(requestUserId, emotionRecordId);
+
+        // then
+        assertEquals(202, result.getCode());
+    }
+
     @Test
     @DisplayName("채팅 요청 거절")
     void testRequestRejected_SUCCESS() {