diff --git a/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomController.java b/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomController.java
index e5e0ff02..0619ffe5 100644
--- a/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomController.java
+++ b/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomController.java
@@ -21,6 +21,7 @@
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PatchMapping;
 import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
@@ -82,4 +83,14 @@ public ResponseEntity<Void> cancelProgress(
     chatRoomService.cancelProgress(customOAuth2User.getMember(), chatRoomId);
     return ResponseEntity.ok().build();
   }
+
+  @Override
+  @PostMapping("/{chat-room-id}/leave")
+  @LogMonitoring
+  public ResponseEntity<Void> leaveChatRoom(
+    @AuthenticationPrincipal CustomOAuth2User customOAuth2User,
+    @PathVariable("chat-room-id") String chatRoomId) {
+    chatRoomService.leaveChatRoom(customOAuth2User.getMember(), chatRoomId);
+    return ResponseEntity.ok().build();
+  }
 }
diff --git a/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomControllerDocs.java b/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomControllerDocs.java
index ff378c07..d91c8e01 100644
--- a/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomControllerDocs.java
+++ b/ticketmate-api/src/main/java/com/ticketmate/backend/api/application/controller/chat/ChatRoomControllerDocs.java
@@ -287,4 +287,42 @@ ResponseEntity<ApplicationFormInfoResponse> chatRoomApplicationFormInfo(
       """
   )
   ResponseEntity<Void> cancelProgress(CustomOAuth2User customOAuth2User, String chatRoomId);
+
+  @ApiChangeLogs({
+    @ApiChangeLog(
+      date = "2026-01-28",
+      author = "mr6208",
+      description = "채팅방 나가기 API 설계",
+      issueUrl = ""
+    )
+  })
+  @Operation(
+    summary = "채팅방 나가기 기능",
+    description = """
+                
+      이 API는 인증이 필요합니다.
+                
+      ### 요청 파라미터
+      - **chat-room-id (String)** : 채팅방 고유 ID [필수]
+                
+      ### 반환 데이터 
+      - 상태코드만을 반환합니다.
+            
+      ### 변경된 중요한 부분들
+      - 카카오톡 오픈채팅을 레퍼런스로 참고해서 최대한 비슷하게 설계했습니다.
+      - 1:1 채팅도중 상대방이 나갔을 시 내 기준에서는 과거 채팅목록 조회가 가능하지만 채팅은 불가합니다.
+      - 상대방 기준에서는(나간사람) 채팅방 목록에 나간 채팅방이 보이지 않고 채팅방 내부 조회 자체가 불가능합니다.
+      - 이런 요구사항을 반영하기 위해 기존 응답데이터에 대한 변경이 이루어졌습니다.
+            
+      ### 아래는 채팅방 리스트업 및 채팅방 내부 조회시 추가된 데이터입니다.
+      ```json
+      {
+       "chatEnabled(현재 채팅이 가능한지 알려주는 플래그)": "true/false",
+       "opponentLeft(현재 채팅방에서 상대방이 나갔는지를 알려주는 플래그)": true/false
+      }
+      ```
+            
+      """
+  )
+  ResponseEntity<Void> leaveChatRoom(CustomOAuth2User customOAuth2User, String chatRoomId);
 }
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomContextResponse.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomContextResponse.java
index 47e5d128..24cc37af 100644
--- a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomContextResponse.java
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomContextResponse.java
@@ -24,10 +24,13 @@ public class ChatRoomContextResponse {
   private List<TicketOpenDateInfoResponse> ticketOpenDateInfoResponseList; // 티켓 오픈일 List
   private TicketReservationSite ticketReservationSite;  // 예매처
   private ConcertType concertType;  // 공연 카테고리
+  private boolean chatEnabled;  // 현재 채팅이 가능한지
+  private boolean opponentLeft;  // 상대방이 나갔는지
 
   @Builder
   public ChatRoomContextResponse(String chatRoomId, UUID opponentMemberId, UUID fulfillmentFormId, String opponentMemberNickName, String concertName, String concertThumbnailUrl,
-    TicketOpenType ticketOpenType, List<TicketOpenDateInfoResponse> ticketOpenDateInfoResponseList, TicketReservationSite ticketReservationSite, ConcertType concertType) {
+    TicketOpenType ticketOpenType, List<TicketOpenDateInfoResponse> ticketOpenDateInfoResponseList, TicketReservationSite ticketReservationSite, ConcertType concertType, boolean chatEnabled,
+    boolean opponentLeft) {
     this.chatRoomId = chatRoomId;
     this.opponentMemberId = opponentMemberId;
     this.fulfillmentFormId = fulfillmentFormId;
@@ -38,5 +41,7 @@ public ChatRoomContextResponse(String chatRoomId, UUID opponentMemberId, UUID fu
     this.ticketOpenDateInfoResponseList = ticketOpenDateInfoResponseList;
     this.ticketReservationSite = ticketReservationSite;
     this.concertType = concertType;
+    this.chatEnabled = chatEnabled;
+    this.opponentLeft = opponentLeft;
   }
 }
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomResponse.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomResponse.java
index 6b41679c..914ef72c 100644
--- a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomResponse.java
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/dto/response/ChatRoomResponse.java
@@ -11,6 +11,7 @@
 @Setter
 @NoArgsConstructor
 public class ChatRoomResponse {
+
   private String chatRoomId;  // 채팅방 PK
   private String chatRoomName;  // 상대방 닉네임 출력
   private String lastChatMessage;  // 마지막 채팅 메시지
@@ -19,10 +20,12 @@ public class ChatRoomResponse {
   private String concertThumbnailUrl; // 콘서트 썸네일 사진
   private TicketOpenType ticketOpenType;  // 선예매/일예 구분
   private int unReadMessageCount;  // 읽지 않은 메시지 개수
+  private boolean chatEnabled;   // 메시지 전송 가능 여부
+  private boolean opponentLeft;  // 상대가 나갔는지(전송불가)
 
   @Builder
-  public ChatRoomResponse(String chatRoomId, String chatRoomName, String lastChatMessage, LocalDateTime lastChatSendTime, String profileUrl, String concertThumbnailUrl,
-      TicketOpenType ticketOpenType, int unReadMessageCount) {
+  public ChatRoomResponse(String chatRoomId, String chatRoomName, String lastChatMessage, LocalDateTime lastChatSendTime, String profileUrl, String concertThumbnailUrl, TicketOpenType ticketOpenType,
+    int unReadMessageCount, boolean chatEnabled, boolean opponentLeft) {
     this.chatRoomId = chatRoomId;
     this.chatRoomName = chatRoomName;
     this.lastChatMessage = lastChatMessage;
@@ -31,5 +34,7 @@ public ChatRoomResponse(String chatRoomId, String chatRoomName, String lastChatM
     this.concertThumbnailUrl = concertThumbnailUrl;
     this.ticketOpenType = ticketOpenType;
     this.unReadMessageCount = unReadMessageCount;
+    this.chatEnabled = chatEnabled;
+    this.opponentLeft = opponentLeft;
   }
 }
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/mapper/ChatMapperImpl.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/mapper/ChatMapperImpl.java
index 04b45581..31864bc6 100644
--- a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/mapper/ChatMapperImpl.java
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/mapper/ChatMapperImpl.java
@@ -56,6 +56,9 @@ public ChatRoomResponse toChatRoomResponse(ChatRoom chatRoom, Member member, Map
     String concertThumbnailStoredPath = applicationForm.getConcert().getConcertThumbnailStoredPath();
     String profileImgStoredPath = other.getProfileImgStoredPath();
 
+    boolean chatEnabled = chatRoom.canChat();
+    boolean opponentLeft = chatRoom.isLeft(opponentId);
+
     return ChatRoomResponse.builder()
       .unReadMessageCount(unRead)
       .chatRoomId(chatRoom.getChatRoomId())
@@ -65,12 +68,19 @@ public ChatRoomResponse toChatRoomResponse(ChatRoom chatRoom, Member member, Map
       .concertThumbnailUrl(storageService.generatePublicUrl(concertThumbnailStoredPath))
       .lastChatSendTime(TimeUtil.toLocalDateTime(chatRoom.getLastMessageTime()))
       .profileUrl(storageService.generatePublicUrl(profileImgStoredPath))
+      .chatEnabled(chatEnabled)
+      .opponentLeft(opponentLeft)
       .build();
   }
 
   @Override
   public ChatRoomContextResponse toChatRoomContextResponse(ChatRoom chatRoom, UUID currentMemberId,
     UUID fulfillmentFormId, TicketOpenType ticketOpenType, String opponentMemberNickname, ConcertInfoResponse response) {
+
+    UUID opponentId = chatRoom.getOpponentId(currentMemberId);
+    boolean chatEnabled = chatRoom.canChat();
+    boolean opponentLeft = chatRoom.isLeft(opponentId);
+
     return ChatRoomContextResponse.builder()
       .concertName(response.concertName())
       .concertType(response.concertType())
@@ -82,6 +92,8 @@ public ChatRoomContextResponse toChatRoomContextResponse(ChatRoom chatRoom, UUID
       .ticketOpenDateInfoResponseList(response.ticketOpenDateInfoResponseList())
       .chatRoomId(chatRoom.getChatRoomId())
       .ticketOpenType(ticketOpenType)
+      .chatEnabled(chatEnabled)
+      .opponentLeft(opponentLeft)
       .build();
   }
 }
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatMessageService.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatMessageService.java
index 8a2cb548..06f44486 100644
--- a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatMessageService.java
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatMessageService.java
@@ -266,6 +266,8 @@ private String formattingSendDate(LocalDateTime dateTime) {
    * 채팅 메시지 저장 + Redis를 이용해 읽지않은 메시지 count, 및 브로드캐스팅을 관리하는 메서드
    */
   private ChatMessage handleNewChatMessage(Member sender, ChatMessageRequest request, ChatRoom chatRoom) {
+    // 현재 채팅을 진행할 수 있는지 검증
+    validateCanChat(chatRoom);
 
     ChatMessage message = saveChatMessage(sender, request, chatRoom);
 
@@ -466,4 +468,11 @@ private String toPreview(ChatMessage chatMessage) {
       case UPDATE_FULFILLMENT_FORM -> ChatMessageType.UPDATE_FULFILLMENT_FORM.getDescription();
     };
   }
+
+  // 현재 채팅을 진행 수 있는 상태인지(한명이라도 나가면 채팅 불가)
+  private void validateCanChat(ChatRoom room) {
+    if (!room.canChat()) {
+      throw new CustomException(ErrorCode.CHAT_DISABLED);
+    }
+  }
 }
\ No newline at end of file
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatRoomService.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatRoomService.java
index bb1bf5b1..a55d661c 100644
--- a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatRoomService.java
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/application/service/ChatRoomService.java
@@ -22,6 +22,7 @@
 import com.ticketmate.backend.concert.infrastructure.entity.Concert;
 import com.ticketmate.backend.member.infrastructure.entity.Member;
 import com.ticketmate.backend.member.infrastructure.repository.MemberRepository;
+import java.time.Instant;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
@@ -169,8 +170,8 @@ public Slice<ChatMessageResponse> getChatMessage(Member member, String chatRoomI
     ChatRoom chatRoom = chatRoomRepository.findById(chatRoomId)
       .orElseThrow(() -> new CustomException(ErrorCode.CHAT_ROOM_NOT_FOUND));
 
-    // 채팅방 내부 참가자 유효성 검증
-    validateRoomMember(chatRoom, member);
+    // 채팅방 내부 참가자 유효성 검증 및 채팅방 유효성 검증
+    validateActiveParticipant(chatRoom, member);
 
     // 채팅메시지 전용 페이지네이션 객체 생성
     Pageable pageable = request.toPageable();
@@ -224,6 +225,26 @@ public void cancelProgress(Member member, String chatRoomId) {
     applicationForm.setApplicationFormStatus(ApplicationFormStatus.CANCELED_IN_PROCESS);
   }
 
+  // 채팅방 나가기 기능
+  @Transactional
+  public void leaveChatRoom(Member member, String chatRoomId) {
+    ChatRoom chatRoom = findChatRoomById(chatRoomId);
+    validateRoomMember(chatRoom, member);
+
+    UUID memberId = member.getMemberId();
+    if (chatRoom.isLeft(memberId)) {
+      return;
+    }
+
+    chatRoom.leave(memberId, Instant.now());
+    chatRoomRepository.save(chatRoom);
+
+    // unread 키 삭제
+    String key = (UN_READ_MESSAGE_COUNTER_KEY).formatted(chatRoomId, memberId);
+    redisTemplate.delete(key);
+    log.debug("채팅방 나가기 완료. 채팅방 상태 : {}, 나간 시간: {}", chatRoom.getRoomStatus(), chatRoom.getClosedDate());
+  }
+
   /**
    * 방 참가자 검증
    */
@@ -235,6 +256,14 @@ public void validateRoomMember(ChatRoom room, Member member) {
     }
   }
 
+  private void validateActiveParticipant(ChatRoom room, Member member) {
+    validateRoomMember(room, member);
+
+    if (room.isLeft(member.getMemberId())) {
+      throw new CustomException(ErrorCode.CHAT_ROOM_LEFT);
+    }
+  }
+
   /**
    * 채팅방 조회 공용 메서드
    */
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/core/constant/ChatRoomStatus.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/core/constant/ChatRoomStatus.java
new file mode 100644
index 00000000..acd914e7
--- /dev/null
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/core/constant/ChatRoomStatus.java
@@ -0,0 +1,15 @@
+package com.ticketmate.backend.chat.core.constant;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum ChatRoomStatus {
+  ACTIVE("열린 채팅방"),
+
+  CLOSED("닫힌 채팅방");
+
+  private final String description;
+
+}
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/entity/ChatRoom.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/entity/ChatRoom.java
index 58e1a413..62d0cc03 100644
--- a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/entity/ChatRoom.java
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/entity/ChatRoom.java
@@ -1,12 +1,16 @@
 package com.ticketmate.backend.chat.infrastructure.entity;
 
 import com.ticketmate.backend.chat.core.constant.ChatMessageType;
+import com.ticketmate.backend.chat.core.constant.ChatRoomStatus;
+import com.ticketmate.backend.common.application.exception.CustomException;
+import com.ticketmate.backend.common.application.exception.ErrorCode;
 import com.ticketmate.backend.common.infrastructure.persistence.BaseMongoDocument;
 import com.ticketmate.backend.concert.core.constant.TicketOpenType;
 import java.time.Instant;
 import java.util.UUID;
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
+import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -68,6 +72,19 @@ public class ChatRoom extends BaseMongoDocument {
 
   private TicketOpenType ticketOpenType; // 신청폼의 선예매, 일반예매인지
 
+  @Indexed
+  private Instant agentLeftDate;  // 대리인 퇴장시간
+
+  @Indexed
+  private Instant clientLeftDate;  // 의뢰인 퇴장시간
+
+  @Indexed
+  @Builder.Default
+  private ChatRoomStatus roomStatus = ChatRoomStatus.ACTIVE;  // 한명이라도 나가면 CLOSED 상태
+
+  @Indexed
+  private Instant closedDate;
+
   public void updateLastMessage(String message) {
     this.lastMessage = message;
   }
@@ -88,4 +105,40 @@ public void updateLastMessageType(ChatMessageType chatMessageType) {
   public UUID getOpponentId(UUID currentMemberId) {
     return currentMemberId.equals(agentMemberId) ? clientMemberId : agentMemberId;
   }
+
+  public boolean isLeft(UUID memberId) {
+    if (memberId.equals(agentMemberId)) {
+      return agentLeftDate != null;
+    }
+    if (memberId.equals(clientMemberId)) {
+      return clientLeftDate != null;
+    }
+    return false;
+  }
+
+  public boolean isParticipant(UUID memberId) {
+    return memberId.equals(agentMemberId) || memberId.equals(clientMemberId);
+  }
+
+  public boolean canChat() {
+    // 상대가 나갔을시 남아있는 사람도 채팅 불가
+    return roomStatus == ChatRoomStatus.ACTIVE && agentLeftDate == null && clientLeftDate == null;
+  }
+
+  // 채팅방을 나갈 시 동작하는 메서드
+  public void leave(UUID memberId, Instant now) {
+    if (memberId.equals(agentMemberId)) {
+      agentLeftDate = now;
+    } else if (memberId.equals(clientMemberId)) {
+      clientLeftDate = now;
+    } else {
+      throw new CustomException(ErrorCode.NO_AUTH_TO_ROOM);
+    }
+
+    // 한 명이라도 나가면 방은 CLOSED
+    if (roomStatus != ChatRoomStatus.CLOSED) {
+      roomStatus = ChatRoomStatus.CLOSED;
+      closedDate = now;
+    }
+  }
 }
diff --git a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/repository/ChatRoomRepositoryImpl.java b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/repository/ChatRoomRepositoryImpl.java
index fee76728..f63673e7 100644
--- a/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/repository/ChatRoomRepositoryImpl.java
+++ b/ticketmate-chat/src/main/java/com/ticketmate/backend/chat/infrastructure/repository/ChatRoomRepositoryImpl.java
@@ -34,8 +34,9 @@ public Page<ChatRoom> search(TicketOpenType ticketOpenType, String keyword, Memb
 
     log.debug("선예매 일반예매 구분 : {}", ticketOpenType);
 
-    // 1. 내가 ‘대리인’으로 들어가 있는 방 조건
-    Criteria asAgent = Criteria.where("agentMemberId").is(memberId);
+    // 1. 내가 ‘대리인’으로 들어가 있는 방 조건 + 나가지 않은 채팅방(나간시점의 기록이 없는)
+    Criteria asAgent = Criteria.where("agentMemberId").is(memberId).and("agentLeftAt").is(null);
+    
     if (ticketOpenType != null) {
       asAgent = asAgent.and("ticketOpenType").is(ticketOpenType);
     }
@@ -43,8 +44,8 @@ public Page<ChatRoom> search(TicketOpenType ticketOpenType, String keyword, Memb
       asAgent = asAgent.and("clientMemberNickname").regex(keyword, "i");
     }
 
-    // 2. 내가 ‘의뢰인’으로 들어가 있는 방 조건
-    Criteria asClient = Criteria.where("clientMemberId").is(memberId);
+    // 2. 내가 ‘의뢰인’으로 들어가 있는 방 조건 + 위와 동일
+    Criteria asClient = Criteria.where("clientMemberId").is(memberId).and("clientLeftAt").is(null);
     if (ticketOpenType != null) {
       asClient = asClient.and("ticketOpenType").is(ticketOpenType);
     }
@@ -57,9 +58,9 @@ public Page<ChatRoom> search(TicketOpenType ticketOpenType, String keyword, Memb
 
     // 마지막 채팅 메시지 시간 기준 내림차순 정렬 (6개씩)
     Query query = Query.query(criteria)
-        .with(Sort.by(Sort.Direction.DESC, "lastMessageTime"))
-        .skip((long) pageNumber * PageableConstants.DEFAULT_PAGE_SIZE)
-        .limit(PageableConstants.DEFAULT_PAGE_SIZE);
+      .with(Sort.by(Sort.Direction.DESC, "lastMessageTime"))
+      .skip((long) pageNumber * PageableConstants.DEFAULT_PAGE_SIZE)
+      .limit(PageableConstants.DEFAULT_PAGE_SIZE);
 
     List<ChatRoom> chatRoomList = mongoTemplate.find(query, ChatRoom.class);
     log.debug("조회된 채팅방 객체 개수 : {}", chatRoomList.size());
@@ -68,7 +69,7 @@ public Page<ChatRoom> search(TicketOpenType ticketOpenType, String keyword, Memb
     log.debug("Count로 조회된 채팅방 개수 : {}", totalCount);
 
     return new PageImpl<>(chatRoomList,
-        PageRequest.of(pageNumber, PageableConstants.DEFAULT_PAGE_SIZE),
-        totalCount);
+      PageRequest.of(pageNumber, PageableConstants.DEFAULT_PAGE_SIZE),
+      totalCount);
   }
 }
diff --git a/ticketmate-common/src/main/java/com/ticketmate/backend/common/application/exception/ErrorCode.java b/ticketmate-common/src/main/java/com/ticketmate/backend/common/application/exception/ErrorCode.java
index 79198a2f..dc8aed87 100644
--- a/ticketmate-common/src/main/java/com/ticketmate/backend/common/application/exception/ErrorCode.java
+++ b/ticketmate-common/src/main/java/com/ticketmate/backend/common/application/exception/ErrorCode.java
@@ -399,6 +399,10 @@ public enum ErrorCode {
 
   CHAT_MESSAGE_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "채팅 메시지 전송중 오류가 발생했습니다."),
 
+  CHAT_ROOM_LEFT(HttpStatus.NOT_FOUND, "채팅방을 나가서 존재하지 않는 채팅방입니다."),
+
+  CHAT_DISABLED(HttpStatus.BAD_REQUEST, "해당 채팅방은 상대방이 채팅방을 나가 채팅을 진행할 수 없습니다."),
+
   // EMBEDDING
 
   EMBEDDING_API_ERROR(HttpStatus.BAD_REQUEST, "Vertex AI API 호출에 실패했습니다."),
diff --git a/ticketmate-fulfillmentform/src/main/java/com/ticketmate/backend/fulfillmentform/application/service/successhistory/SuccessHistoryService.java b/ticketmate-fulfillmentform/src/main/java/com/ticketmate/backend/fulfillmentform/application/service/successhistory/SuccessHistoryService.java
index 05389453..3719ea6a 100644
--- a/ticketmate-fulfillmentform/src/main/java/com/ticketmate/backend/fulfillmentform/application/service/successhistory/SuccessHistoryService.java
+++ b/ticketmate-fulfillmentform/src/main/java/com/ticketmate/backend/fulfillmentform/application/service/successhistory/SuccessHistoryService.java
@@ -6,9 +6,6 @@
 import com.ticketmate.backend.fulfillmentform.infrastructure.entity.FulfillmentForm;
 import com.ticketmate.backend.fulfillmentform.infrastructure.entity.SuccessHistory;
 import com.ticketmate.backend.fulfillmentform.infrastructure.repository.successhistory.SuccessHistoryRepository;
-import com.ticketmate.backend.member.application.service.MemberService;
-import com.ticketmate.backend.member.core.constant.MemberType;
-import com.ticketmate.backend.member.infrastructure.entity.Member;
 import jakarta.persistence.EntityManager;
 import java.util.UUID;
 import lombok.RequiredArgsConstructor;
@@ -25,7 +22,6 @@ public class SuccessHistoryService {
 
   private final SuccessHistoryRepository successHistoryRepository;
   private final EntityManager entityManager;
-  private final MemberService memberService;
   private final SuccessHistoryMapper mapper;
 
   public void createSuccessHistory(UUID fulfillmentFormId) {
@@ -40,11 +36,6 @@ public void createSuccessHistory(UUID fulfillmentFormId) {
 
   @Transactional(readOnly = true)
   public Slice<SuccessHistoryResponse> getSuccessHistoryList(UUID agentId, SuccessHistoryFilteredRequest request) {
-    Member agent = memberService.findMemberById(agentId);
-
-    // 조회객체가 대리인이 정말 맞는지
-    memberService.validateMemberType(agent, MemberType.AGENT);
-
     // 페이지네이션 객체 생성
     Pageable pageable = request.toPageable();