diff --git a/src/main/java/com/assu/server/domain/chat/converter/ChatConverter.java b/src/main/java/com/assu/server/domain/chat/converter/ChatConverter.java
index 70fe10c2..6082b4c3 100644
--- a/src/main/java/com/assu/server/domain/chat/converter/ChatConverter.java
+++ b/src/main/java/com/assu/server/domain/chat/converter/ChatConverter.java
@@ -63,6 +63,7 @@ public static Message toMessageEntity(ChatRequestDTO.ChatMessageRequestDTO reque
 
     public static ChatResponseDTO.SendMessageResponseDTO toSendMessageDTO(Message message) {
         return ChatResponseDTO.SendMessageResponseDTO.builder()
+                .messageId(message.getId())
                 .roomId(message.getChattingRoom().getId())
                 .senderId(message.getSender().getId())
                 .receiverId(message.getReceiver().getId())
diff --git a/src/main/java/com/assu/server/domain/chat/repository/ChatRepository.java b/src/main/java/com/assu/server/domain/chat/repository/ChatRepository.java
index c3270c4b..8cdeb467 100644
--- a/src/main/java/com/assu/server/domain/chat/repository/ChatRepository.java
+++ b/src/main/java/com/assu/server/domain/chat/repository/ChatRepository.java
@@ -30,20 +30,20 @@ SELECT MAX(m2.createdAt)
      AND m.receiver.id = :memberId
      AND m.isRead = false),
      CASE
-         WHEN pm.id   IS NULL AND am.id = :memberId THEN NULL
-         WHEN am.id   IS NULL AND pm.id = :memberId THEN NULL
+         WHEN pm.id   IS NULL AND am.id = :memberId THEN -1
+         WHEN am.id   IS NULL AND pm.id = :memberId THEN -1
          WHEN pm.id = :memberId THEN a.id
          ELSE p.id
        END,
      CASE
-         WHEN pm.id   IS NULL AND am.id = :memberId THEN NULL
-         WHEN am.id   IS NULL AND pm.id = :memberId THEN NULL
+         WHEN pm.id   IS NULL AND am.id = :memberId THEN -1
+         WHEN am.id   IS NULL AND pm.id = :memberId THEN -1
          WHEN pm.id = :memberId THEN a.name
          ELSE p.name
        END,
      CASE
-         WHEN pm.id   IS NULL AND am.id = :memberId THEN NULL
-         WHEN am.id   IS NULL AND pm.id = :memberId THEN NULL
+         WHEN pm.id   IS NULL AND am.id = :memberId THEN -1
+         WHEN am.id   IS NULL AND pm.id = :memberId THEN -1
          WHEN pm.id = :memberId THEN am.profileUrl
          ELSE pm.profileUrl
        END
@@ -55,6 +55,10 @@ SELECT MAX(m2.createdAt)
       LEFT JOIN a.member  am
       WHERE pm.id = :memberId
       OR am.id = :memberId
+      ORDER BY
+             (SELECT MAX(m.createdAt)
+              FROM Message m
+              WHERE m.chattingRoom.id = r.id) DESC
     """)
     List<ChatRoomListResultDTO> findChattingRoomsByMemberId(@Param("memberId") Long memberId);
 
diff --git a/src/main/java/com/assu/server/domain/chat/service/ChatServiceImpl.java b/src/main/java/com/assu/server/domain/chat/service/ChatServiceImpl.java
index cd8d672a..df09fde5 100644
--- a/src/main/java/com/assu/server/domain/chat/service/ChatServiceImpl.java
+++ b/src/main/java/com/assu/server/domain/chat/service/ChatServiceImpl.java
@@ -162,9 +162,21 @@ public ChatResponseDTO.LeaveChattingRoomResponseDTO leaveChattingRoom(Long roomI
             isLeftSuccessfully = true;
             chatRepository.save(chattingRoom);
         } else if(memberCount == 1) {
-            isRoomDeleted = true;
+            if (isAdmin) {
+                chattingRoom.setAdmin(null);
+            } else if (isPartner) {
+                chattingRoom.setPartner(null);
+            }
+            chattingRoom.updateMemberCount(0);
             isLeftSuccessfully = true;
-            chatRepository.delete(chattingRoom);
+
+            // ✅ 방에 아무도 안 남았을 때만 삭제
+            if (chattingRoom.getAdmin() == null && chattingRoom.getPartner() == null) {
+                isRoomDeleted = true;
+                chatRepository.delete(chattingRoom);
+            } else {
+                chatRepository.save(chattingRoom);
+            }
 
         } else if(memberCount == 0) {
             throw new DatabaseException(ErrorStatus.NO_MEMBER);
diff --git a/src/main/java/com/assu/server/domain/partnership/converter/PartnershipConverter.java b/src/main/java/com/assu/server/domain/partnership/converter/PartnershipConverter.java
index 1cf7bac1..c2f0a263 100644
--- a/src/main/java/com/assu/server/domain/partnership/converter/PartnershipConverter.java
+++ b/src/main/java/com/assu/server/domain/partnership/converter/PartnershipConverter.java
@@ -279,6 +279,8 @@ public static PartnershipResponseDTO.WritePartnershipResponseDTO writePartnershi
                 .adminId(paper.getAdmin()    != null ? paper.getAdmin().getId()     : null)
                 .partnerId(paper.getPartner()!= null ? paper.getPartner().getId()   : null) // 수동등록이면 null
                 .storeId(paper.getStore()    != null ? paper.getStore().getId()     : null)
+                .storeName(paper.getStore().getName())
+                .adminName(paper.getAdmin().getName())
 				.isActivated(paper.getIsActivated())
                 .options(optionDTOS)
                 .build();
diff --git a/src/main/java/com/assu/server/domain/partnership/dto/PartnershipResponseDTO.java b/src/main/java/com/assu/server/domain/partnership/dto/PartnershipResponseDTO.java
index 2483b94e..2229ca23 100644
--- a/src/main/java/com/assu/server/domain/partnership/dto/PartnershipResponseDTO.java
+++ b/src/main/java/com/assu/server/domain/partnership/dto/PartnershipResponseDTO.java
@@ -24,6 +24,9 @@ public static class WritePartnershipResponseDTO {
         private Long adminId;
         private Long partnerId;
         private Long storeId;
+        private String storeName;
+        private String adminName;
+        private Boolean activated;
         private ActivationStatus isActivated;
         private List<PartnershipOptionResponseDTO> options;
     }