diff --git a/src/app/message/chat/[roomId]/ChatRoomPage.tsx b/src/app/message/chat/[roomId]/ChatRoomPage.tsx
index 8d5ac356..ec56aaac 100644
--- a/src/app/message/chat/[roomId]/ChatRoomPage.tsx
+++ b/src/app/message/chat/[roomId]/ChatRoomPage.tsx
@@ -4,8 +4,11 @@ import { useRouter } from 'next/navigation';
 
 import { useEffect, useLayoutEffect, useRef, useState } from 'react';
 
+import NotFound from '@/app/not-found';
 import { ChatHeader, ChatInput, MyChat, OtherChat } from '@/components/pages/chat';
 import { UserList } from '@/components/pages/chat/chat-user-list';
+import { Toast } from '@/components/ui';
+import { useToast } from '@/components/ui/toast/core';
 import {
   useChatSocket,
   useGetChatMessages,
@@ -25,9 +28,11 @@ const ChatRoomPage = ({ accessToken, roomId, userId }: IProps) => {
   const [isUserListOpen, setIsUserListOpen] = useState(false);
   const [chatMessages, setChatMessages] = useState<ChatMessage[]>([]);
 
-  const { data: chatInfo } = useGetChatRoom(roomId);
+  const { data: chatInfo, error, isError } = useGetChatRoom(roomId);
   const { data: previousMessages } = useGetChatMessages(roomId);
   const { mutate: readMessages } = useReadMessages(roomId, userId);
+  const { run } = useToast();
+
   const {
     messages: newMessages,
     sendMessage,
@@ -36,17 +41,15 @@ const ChatRoomPage = ({ accessToken, roomId, userId }: IProps) => {
     roomId,
     userId,
     accessToken,
+    enabled: !!chatInfo,
     onMessage: (message) => {
-      console.log('새 메시지:', message);
-      setChatMessages((prev) => [...prev, message]);
-    },
-    // 백엔드 로직 확인 필요.(동작 X)
-    onNotification: (notification) => {
-      console.log(notification);
-      if (notification.type === 'KICKED' && notification.chatRoomId === roomId) {
-        alert('채팅방에서 추방되었습니다.');
+      if (message.messageType === 'KICK' && message.targetUserId === userId) {
         router.replace('/');
+        run(<Toast type='info'>채팅방에서 추방당했어요.</Toast>);
+        return;
       }
+      console.log('새 메시지:', message);
+      setChatMessages((prev) => [...prev, message]);
     },
   });
 
@@ -79,6 +82,20 @@ const ChatRoomPage = ({ accessToken, roomId, userId }: IProps) => {
     });
   }, [chatMessages.length]);
 
+  if (isError) {
+    const status = error?.status;
+
+    if (status === 403) {
+      run(<Toast type='info'>채팅방에 입장할 수 없습니다.</Toast>);
+      router.replace('/');
+      return null;
+    }
+
+    if (status === 404) {
+      return <NotFound />;
+    }
+  }
+
   return (
     <div className='relative h-[calc(100vh-112px)] overflow-hidden'>
       {/* 채팅 화면 */}
@@ -117,6 +134,7 @@ const ChatRoomPage = ({ accessToken, roomId, userId }: IProps) => {
         <UserList
           roomId={roomId}
           roomType={chatInfo?.chatType as 'DM' | 'GROUP'}
+          userId={userId}
           onClose={() => setIsUserListOpen(false)}
         />
       </div>
diff --git a/src/components/pages/chat/chat-user-list/index.tsx b/src/components/pages/chat/chat-user-list/index.tsx
index 4bb24fba..f8e79059 100644
--- a/src/components/pages/chat/chat-user-list/index.tsx
+++ b/src/components/pages/chat/chat-user-list/index.tsx
@@ -16,13 +16,18 @@ interface UserListProps {
   onClose: () => void;
   roomId: number;
   roomType: 'DM' | 'GROUP';
+  userId: number;
 }
 
-export const UserList = ({ onClose, roomId, roomType }: UserListProps) => {
+export const UserList = ({ onClose, roomId, roomType, userId }: UserListProps) => {
   const [isManaging, setIsManaging] = useState(false);
   const { open } = useModal();
   const { data } = useGetParticipants(roomId);
-  console.log(roomType);
+
+  const isCurrentUserOwner = data?.participants.some(
+    (participant) => participant.userId === userId && participant.isOwner,
+  );
+
   return (
     <div className='bg-mono-white flex h-[calc(100vh-112px)] flex-col'>
       {/* 헤더 */}
@@ -32,19 +37,19 @@ export const UserList = ({ onClose, roomId, roomType }: UserListProps) => {
           <span className='text-gray-800'>참여자</span>
           <span className='text-mint-500'>{data?.totalCount}</span>
         </span>
-        {roomType === 'GROUP' ? (
+        {roomType === 'GROUP' && isCurrentUserOwner ? (
           <button
             className='text-text-sm-semibold cursor-pointer'
             onClick={() => setIsManaging(!isManaging)}
           >
             {isManaging ? (
-              <span className='text-gray-600'>완료</span>
+              <span className='w-6 text-gray-600'>완료</span>
             ) : (
-              <span className='text-mint-600'>관리</span>
+              <span className='text-mint-600 w-6'>관리</span>
             )}
           </button>
         ) : (
-          <div></div>
+          <div className='w-6'></div>
         )}
       </div>
 
@@ -70,8 +75,7 @@ export const UserList = ({ onClose, roomId, roomType }: UserListProps) => {
                 </div>
               </div>
 
-              {/* 방장이 0번째로 들어온다면 이렇게, 방장이라는걸 알 수 있는 필드가 있다면 수정 */}
-              {roomType === 'GROUP' && index === 0 ? (
+              {roomType === 'GROUP' && user.isOwner ? (
                 <span className='bg-mint-100 text-mint-700 text-text-xs-medium rounded-full px-2.5 py-1'>
                   방장
                 </span>
diff --git a/src/components/pages/message/message-following-modal/index.test.tsx b/src/components/pages/message/message-following-modal/index.test.tsx
index 8ffa4ade..0679890f 100644
--- a/src/components/pages/message/message-following-modal/index.test.tsx
+++ b/src/components/pages/message/message-following-modal/index.test.tsx
@@ -2,6 +2,7 @@ import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 
 import { ModalProvider } from '@/components/ui';
+import { ToastProvider } from '@/components/ui/toast/core';
 import { useAddFollowers } from '@/hooks/use-follower';
 
 import { FollowingModal } from '.';
@@ -24,7 +25,9 @@ const renderWithQueryClient = async (component: React.ReactElement) => {
   await act(async () => {
     renderResult = render(
       <QueryClientProvider client={testQueryClient}>
-        <ModalProvider>{component}</ModalProvider>
+        <ToastProvider>
+          <ModalProvider>{component}</ModalProvider>
+        </ToastProvider>
       </QueryClientProvider>,
     );
   });
@@ -33,15 +36,14 @@ const renderWithQueryClient = async (component: React.ReactElement) => {
 };
 
 describe('FollowingModal 테스트', () => {
-  const mockMutate = jest.fn();
+  const mockMutateAsync = jest.fn();
   const mockUserId = 123;
 
   beforeEach(() => {
     jest.clearAllMocks();
 
-    // 기본 mock 설정
     (useAddFollowers as jest.Mock).mockReturnValue({
-      mutate: mockMutate,
+      mutateAsync: mockMutateAsync,
     });
   });
 
@@ -62,9 +64,7 @@ describe('FollowingModal 테스트', () => {
   });
 
   test('Enter 키 입력 시 폼이 제출된다', async () => {
-    mockMutate.mockImplementation((_data, options) => {
-      options?.onSuccess?.();
-    });
+    mockMutateAsync.mockResolvedValue(undefined);
 
     await renderWithQueryClient(<FollowingModal userId={mockUserId} />);
 
@@ -73,7 +73,7 @@ describe('FollowingModal 테스트', () => {
     fireEvent.keyDown(input, { key: 'Enter', code: 'Enter' });
 
     await waitFor(() => {
-      expect(mockMutate).toHaveBeenCalledWith({ followNickname: 'test' }, expect.any(Object));
+      expect(mockMutateAsync).toHaveBeenCalledWith({ followNickname: 'test' });
     });
   });
 });
diff --git a/src/components/pages/message/message-following-modal/index.tsx b/src/components/pages/message/message-following-modal/index.tsx
index 77d4c49f..82ab9cac 100644
--- a/src/components/pages/message/message-following-modal/index.tsx
+++ b/src/components/pages/message/message-following-modal/index.tsx
@@ -3,36 +3,32 @@ import { useState } from 'react';
 import { useForm } from '@tanstack/react-form';
 
 import { Icon } from '@/components/icon';
-import { Button, Input, ModalContent, ModalTitle, useModal } from '@/components/ui';
+import { Button, Input, ModalContent, ModalTitle, Toast, useModal } from '@/components/ui';
+import { useToast } from '@/components/ui/toast/core';
 import { useAddFollowers } from '@/hooks/use-follower';
 
 export const FollowingModal = ({ userId }: { userId: number }) => {
   const { close } = useModal();
   const [errorMessage, setErrorMessage] = useState<string | null>(null);
-  const { mutate: addFollower } = useAddFollowers({ userId });
+  const { mutateAsync } = useAddFollowers({ userId });
+  const { run } = useToast();
   const form = useForm({
-    defaultValues: {
-      nickname: '',
-    },
-    onSubmit: ({ value }) => {
+    defaultValues: { nickname: '' },
+    onSubmit: async ({ value }) => {
       const { nickname } = value;
       setErrorMessage(null);
-
-      addFollower(
-        {
-          followNickname: nickname,
-        },
-        {
-          onSuccess: () => {
-            close();
-          },
-          onError: (e) => {
-            setErrorMessage(e.detail.slice(4));
-          },
-        },
-      );
+      try {
+        await mutateAsync({ followNickname: nickname });
+        close();
+        run(<Toast type='success'>{nickname}님을 팔로우 했어요!</Toast>);
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      } catch (error: any) {
+        console.log(error);
+        setErrorMessage(error.detail.slice(4));
+      }
     },
   });
+
   return (
     <ModalContent className='max-w-77.75'>
       <ModalTitle className='mb-3'>팔로우 할 닉네임을 입력하세요</ModalTitle>
diff --git a/src/components/pages/message/message-following-search/index.test.tsx b/src/components/pages/message/message-following-search/index.test.tsx
index 598af25c..d3068904 100644
--- a/src/components/pages/message/message-following-search/index.test.tsx
+++ b/src/components/pages/message/message-following-search/index.test.tsx
@@ -2,6 +2,7 @@ import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { act, fireEvent, render, screen } from '@testing-library/react';
 
 import { ModalProvider } from '@/components/ui';
+import { ToastProvider } from '@/components/ui/toast/core';
 
 import { FollowingSearch } from '.';
 
@@ -19,9 +20,11 @@ const renderComponent = async () => {
   await act(async () => {
     render(
       <QueryClientProvider client={queryClient}>
-        <ModalProvider>
-          <FollowingSearch userId={0} />
-        </ModalProvider>
+        <ToastProvider>
+          <ModalProvider>
+            <FollowingSearch userId={0} />
+          </ModalProvider>
+        </ToastProvider>
       </QueryClientProvider>,
     );
   });
diff --git a/src/hooks/use-chat/use-chat-detail/index.ts b/src/hooks/use-chat/use-chat-detail/index.ts
index e78a0376..b9d9641b 100644
--- a/src/hooks/use-chat/use-chat-detail/index.ts
+++ b/src/hooks/use-chat/use-chat-detail/index.ts
@@ -6,6 +6,7 @@ export const useGetChatRoom = (roomId: number) => {
   const query = useQuery({
     queryKey: ['chatRoom', roomId],
     queryFn: () => API.chatService.getChatRoom({ roomId }),
+    retry: false,
   });
   return query;
 };
diff --git a/src/hooks/use-chat/use-chat-socket/index.ts b/src/hooks/use-chat/use-chat-socket/index.ts
index 9314be0d..d4b7cc61 100644
--- a/src/hooks/use-chat/use-chat-socket/index.ts
+++ b/src/hooks/use-chat/use-chat-socket/index.ts
@@ -8,6 +8,7 @@ import { ChatMessage } from '@/types/service/chat';
 interface UseChatSocketOptions {
   roomId: number;
   userId: number;
+  enabled?: boolean;
   accessToken: string | null;
   onMessage?: (message: ChatMessage) => void;
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
@@ -18,6 +19,7 @@ export const useChatSocket = ({
   roomId,
   userId,
   accessToken,
+  enabled = true,
   onMessage,
   onNotification,
 }: UseChatSocketOptions) => {
@@ -37,12 +39,11 @@ export const useChatSocket = ({
   }, [onNotification]);
 
   useEffect(() => {
-    if (!accessToken) return;
+    if (!accessToken || !enabled) return;
+
     const client = new Client({
       webSocketFactory: () => {
-        const socket = new SockJS(`${process.env.NEXT_PUBLIC_API_BASE_URL}/ws-chat`, null, {
-          transports: ['websocket'], // WebSocket만 사용
-        });
+        const socket = new SockJS(`${process.env.NEXT_PUBLIC_API_BASE_URL}/ws-chat`, null, {});
         return socket;
       },
       connectHeaders: {
@@ -60,16 +61,26 @@ export const useChatSocket = ({
 
       // 채팅방 구독
       client.subscribe(`/sub/chat/room/${roomId}`, (message: IMessage) => {
-        const payload: ChatMessage = JSON.parse(message.body);
-        setMessages((prev) => [...prev, payload]);
-        onMessageRef.current?.(payload);
+        try {
+          const payload: ChatMessage = JSON.parse(message.body);
+          setMessages((prev) => [...prev, payload]);
+          onMessageRef.current?.(payload);
+        } catch (error) {
+          console.error('Failed to parse chat message:', error);
+        }
       });
 
       // 개인 알림 구독
       client.subscribe(`/sub/user/${userId}`, (message: IMessage) => {
-        const payload = JSON.parse(message.body);
-        onNotificationRef.current?.(payload);
+        try {
+          const payload = JSON.parse(message.body);
+          onNotificationRef.current?.(payload);
+        } catch (error) {
+          console.error('Failed to parse notification:', error);
+        }
       });
+
+      clientRef.current = client;
     };
 
     client.onDisconnect = () => {
@@ -79,26 +90,49 @@ export const useChatSocket = ({
 
     client.onStompError = (frame) => {
       console.error('STOMP error:', frame);
+      setIsConnected(false);
+    };
+
+    client.onWebSocketError = (event) => {
+      console.error('WebSocket error:', event);
+      setIsConnected(false);
     };
 
     client.activate();
     clientRef.current = client;
 
     return () => {
-      client.deactivate();
+      if (clientRef.current) {
+        // 연결이 활성화되어 있을 때만 deactivate
+        if (clientRef.current.active) {
+          clientRef.current.deactivate();
+        }
+        clientRef.current = null;
+      }
+      setIsConnected(false);
+      setMessages([]); // 메시지 초기화
     };
-  }, [roomId, userId, accessToken]);
+  }, [roomId, userId, accessToken, enabled]);
 
   const sendMessage = useCallback(
     (content: string) => {
-      if (clientRef.current?.connected) {
+      if (!clientRef.current?.connected) {
+        console.log('WebSocket is not connected');
+        return false;
+      }
+
+      try {
         clientRef.current.publish({
           destination: '/pub/chat/message',
           body: JSON.stringify({
             chatRoomId: roomId,
-            content,
+            content: content.trim(),
           }),
         });
+        return true;
+      } catch (error) {
+        console.error('Failed to send message:', error);
+        return false;
       }
     },
     [roomId],
diff --git a/src/hooks/use-follower/use-follower-add/index.ts b/src/hooks/use-follower/use-follower-add/index.ts
index 8bded4a7..b57d2534 100644
--- a/src/hooks/use-follower/use-follower-add/index.ts
+++ b/src/hooks/use-follower/use-follower-add/index.ts
@@ -15,8 +15,9 @@ export const useAddFollowers = (
       queryClient.invalidateQueries({ queryKey: ['followers', userId] });
       console.log('팔로워 추가 성공');
     },
-    onError: () => {
+    onError: (error) => {
       console.log('팔로워 추가 실패');
+      throw error;
     },
   });
   return query;
diff --git a/src/types/service/chat.ts b/src/types/service/chat.ts
index e19bb403..4d11ae22 100644
--- a/src/types/service/chat.ts
+++ b/src/types/service/chat.ts
@@ -20,9 +20,10 @@ export interface ChatMessage {
   senderName: string | null;
   senderProfileImage: string | null;
   content: string;
-  messageType: 'TEXT' | 'SYSTEM';
+  messageType: 'TEXT' | 'SYSTEM' | 'KICK';
   timestamp?: string;
   createdAt?: string;
+  targetUserId: number;
 }
 
 export interface ChatUser {
@@ -33,6 +34,7 @@ export interface ChatUser {
   status: 'ACTIVE' | 'INACTIVE'; // 확인 필요💥💥
   userId: number;
   profileMessage: string;
+  isOwner: boolean;
 }
 
 export interface GetChatRoomsResponse {