diff --git a/backend/src/main/java/io/f1/backend/domain/game/api/RoomController.java b/backend/src/main/java/io/f1/backend/domain/game/api/RoomController.java
index ffc33605..79a245de 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/api/RoomController.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/api/RoomController.java
@@ -18,9 +18,6 @@
 import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.bind.annotation.RestController;
 
-import java.util.HashMap;
-import java.util.Map;
-
 @RestController
 @RequestMapping("/rooms")
 @RequiredArgsConstructor
@@ -31,12 +28,7 @@ public class RoomController {
     @PostMapping
     @ResponseStatus(HttpStatus.CREATED)
     public RoomCreateResponse saveRoom(@RequestBody @Valid RoomCreateRequest request) {
-
-        Map<String, Object> loginUser = new HashMap<>();
-        loginUser.put("id", 1L);
-        loginUser.put("nickname", "빵야빵야");
-
-        return roomService.saveRoom(request, loginUser);
+        return roomService.saveRoom(request);
     }
 
     @PostMapping("/validation")
diff --git a/backend/src/main/java/io/f1/backend/domain/game/app/RoomService.java b/backend/src/main/java/io/f1/backend/domain/game/app/RoomService.java
index 1ae0e82a..723c8355 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/app/RoomService.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/app/RoomService.java
@@ -1,17 +1,27 @@
 package io.f1.backend.domain.game.app;
 
-import static io.f1.backend.domain.game.mapper.RoomMapper.*;
-
+import static io.f1.backend.domain.game.mapper.RoomMapper.ofPlayerEvent;
+import static io.f1.backend.domain.game.mapper.RoomMapper.toGameSetting;
+import static io.f1.backend.domain.game.mapper.RoomMapper.toGameSettingResponse;
+import static io.f1.backend.domain.game.mapper.RoomMapper.toPlayerListResponse;
+import static io.f1.backend.domain.game.mapper.RoomMapper.toRoomResponse;
+import static io.f1.backend.domain.game.mapper.RoomMapper.toRoomSetting;
+import static io.f1.backend.domain.game.mapper.RoomMapper.toRoomSettingResponse;
+import static io.f1.backend.global.util.SecurityUtils.getCurrentUserId;
+import static io.f1.backend.global.util.SecurityUtils.getCurrentUserNickname;
+
+import io.f1.backend.domain.game.dto.RoomEventType;
+import io.f1.backend.domain.game.dto.RoomExitData;
 import io.f1.backend.domain.game.dto.RoomInitialData;
 import io.f1.backend.domain.game.dto.request.RoomCreateRequest;
 import io.f1.backend.domain.game.dto.request.RoomValidationRequest;
 import io.f1.backend.domain.game.dto.response.GameSettingResponse;
 import io.f1.backend.domain.game.dto.response.PlayerListResponse;
-import io.f1.backend.domain.game.dto.response.QuizResponse;
 import io.f1.backend.domain.game.dto.response.RoomCreateResponse;
 import io.f1.backend.domain.game.dto.response.RoomListResponse;
 import io.f1.backend.domain.game.dto.response.RoomResponse;
 import io.f1.backend.domain.game.dto.response.RoomSettingResponse;
+import io.f1.backend.domain.game.dto.response.SystemNoticeResponse;
 import io.f1.backend.domain.game.event.RoomCreatedEvent;
 import io.f1.backend.domain.game.model.GameSetting;
 import io.f1.backend.domain.game.model.Player;
@@ -29,6 +39,7 @@
 
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.concurrent.atomic.AtomicLong;
 
 @Service
@@ -40,12 +51,15 @@ public class RoomService {
     private final AtomicLong roomIdGenerator = new AtomicLong(0);
     private final ApplicationEventPublisher eventPublisher;
 
-    public RoomCreateResponse saveRoom(RoomCreateRequest request, Map<String, Object> loginUser) {
+    public RoomCreateResponse saveRoom(RoomCreateRequest request) {
+
+        Long quizMinId = quizService.getQuizMinId();
+        Quiz quiz = quizService.getQuizById(quizMinId);
+
+        GameSetting gameSetting = toGameSetting(quiz);
+
+        Player host = createPlayer();
 
-        // todo 제일 작은 index quizId 가져와서 gameSetting(round 설정)
-        GameSetting gameSetting = new GameSetting(1L, 10, 60);
-        // todo security에서 가져오는걸로 변경
-        Player host = new Player((Long) loginUser.get("id"), loginUser.get("nickname").toString());
         RoomSetting roomSetting = toRoomSetting(request);
 
         Long newId = roomIdGenerator.incrementAndGet();
@@ -54,9 +68,6 @@ public RoomCreateResponse saveRoom(RoomCreateRequest request, Map<String, Object
 
         roomRepository.saveRoom(room);
 
-        Long quizId = room.getGameSetting().getQuizId();
-        Quiz quiz = quizService.getQuizById(quizId);
-
         eventPublisher.publishEvent(new RoomCreatedEvent(room, quiz));
 
         return new RoomCreateResponse(newId);
@@ -67,7 +78,7 @@ public void validateRoom(RoomValidationRequest request) {
         Room room =
                 roomRepository
                         .findRoom(request.roomId())
-                        .orElseThrow(() -> new IllegalArgumentException("404 존재하지 않는 방입니다."));
+                        .orElseThrow(() -> new IllegalArgumentException("404 존재하지 않는 방입니다.-1"));
 
         if (room.getState().equals(RoomState.PLAYING)) {
             throw new IllegalArgumentException("403 게임이 진행중입니다.");
@@ -92,26 +103,69 @@ public RoomInitialData enterRoom(Long roomId, String sessionId) {
                         .findRoom(roomId)
                         .orElseThrow(() -> new IllegalArgumentException("404 존재하지 않는 방입니다."));
 
-        // todo security
-        Player player = new Player(1L, "빵야빵야");
+        Player player = createPlayer();
 
         Map<String, Player> playerSessionMap = room.getPlayerSessionMap();
 
         playerSessionMap.put(sessionId, player);
 
-        String destination = "/sub/room/" + roomId;
-
         RoomSettingResponse roomSettingResponse = toRoomSettingResponse(room);
-        // todo quiz 생성 api 완성 후 수정
-        QuizResponse quiz =
-                new QuizResponse(room.getGameSetting().getQuizId(), "title", "설명", "url", 10);
+
+        Long quizId = room.getGameSetting().getQuizId();
+        Quiz quiz = quizService.getQuizById(quizId);
+
         GameSettingResponse gameSettingResponse =
                 toGameSettingResponse(room.getGameSetting(), quiz);
 
         PlayerListResponse playerListResponse = toPlayerListResponse(room);
 
+        SystemNoticeResponse systemNoticeResponse = ofPlayerEvent(player, RoomEventType.ENTER);
+
         return new RoomInitialData(
-                destination, roomSettingResponse, gameSettingResponse, playerListResponse);
+                getDestination(roomId),
+                roomSettingResponse,
+                gameSettingResponse,
+                playerListResponse,
+                systemNoticeResponse);
+    }
+
+    public RoomExitData exitRoom(Long roomId, String sessionId) {
+        Room room =
+                roomRepository
+                        .findRoom(roomId)
+                        .orElseThrow(() -> new IllegalArgumentException("404 존재하지 않는 방입니다."));
+
+        Map<String, Player> playerSessionMap = room.getPlayerSessionMap();
+
+        String destination = getDestination(roomId);
+
+        if (playerSessionMap.size() == 1 && playerSessionMap.get(sessionId) != null) {
+            roomRepository.removeRoom(roomId);
+            return RoomExitData.builder().destination(destination).removedRoom(true).build();
+        }
+
+        Player removedPlayer = playerSessionMap.remove(sessionId);
+        if (removedPlayer == null) {
+            throw new IllegalArgumentException("퇴장 처리 불가 - 404 해당 세션 플레이어는 존재하지않습니다.");
+        }
+
+        if (room.getHost().getId().equals(removedPlayer.getId())) {
+            Optional<String> nextHostSessionId = playerSessionMap.keySet().stream().findFirst();
+            Player nextHost =
+                    playerSessionMap.get(
+                            nextHostSessionId.orElseThrow(
+                                    () ->
+                                            new IllegalArgumentException(
+                                                    "방장 교체 불가 - 404 해당 세션 플레이어는 존재하지않습니다.")));
+            room.updateHost(nextHost);
+        }
+
+        SystemNoticeResponse systemNoticeResponse =
+                ofPlayerEvent(removedPlayer, RoomEventType.EXIT);
+
+        PlayerListResponse playerListResponse = toPlayerListResponse(room);
+
+        return new RoomExitData(destination, playerListResponse, systemNoticeResponse, false);
     }
 
     public RoomListResponse getAllRooms() {
@@ -128,4 +182,12 @@ public RoomListResponse getAllRooms() {
                         .toList();
         return new RoomListResponse(roomResponses);
     }
+
+    private static String getDestination(Long roomId) {
+        return "/sub/room/" + roomId;
+    }
+
+    private static Player createPlayer() {
+        return new Player(getCurrentUserId(), getCurrentUserNickname());
+    }
 }
diff --git a/backend/src/main/java/io/f1/backend/domain/game/dto/MessageType.java b/backend/src/main/java/io/f1/backend/domain/game/dto/MessageType.java
index bb748aac..f6d40420 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/dto/MessageType.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/dto/MessageType.java
@@ -4,4 +4,5 @@ public enum MessageType {
     ROOM_SETTING,
     GAME_SETTING,
     PLAYER_LIST,
+    SYSTEM_NOTICE,
 }
diff --git a/backend/src/main/java/io/f1/backend/domain/game/dto/RoomEventType.java b/backend/src/main/java/io/f1/backend/domain/game/dto/RoomEventType.java
new file mode 100644
index 00000000..c6346c83
--- /dev/null
+++ b/backend/src/main/java/io/f1/backend/domain/game/dto/RoomEventType.java
@@ -0,0 +1,8 @@
+package io.f1.backend.domain.game.dto;
+
+public enum RoomEventType {
+    ENTER,
+    EXIT,
+    START,
+    END,
+}
diff --git a/backend/src/main/java/io/f1/backend/domain/game/dto/RoomExitData.java b/backend/src/main/java/io/f1/backend/domain/game/dto/RoomExitData.java
new file mode 100644
index 00000000..1fc51f2e
--- /dev/null
+++ b/backend/src/main/java/io/f1/backend/domain/game/dto/RoomExitData.java
@@ -0,0 +1,28 @@
+package io.f1.backend.domain.game.dto;
+
+import io.f1.backend.domain.game.dto.response.PlayerListResponse;
+import io.f1.backend.domain.game.dto.response.SystemNoticeResponse;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+public class RoomExitData {
+
+    private final String destination;
+    private final PlayerListResponse playerListResponses;
+    private final SystemNoticeResponse systemNoticeResponse;
+    private final boolean removedRoom;
+
+    @Builder
+    public RoomExitData(
+            String destination,
+            PlayerListResponse playerListResponses,
+            SystemNoticeResponse systemNoticeResponse,
+            boolean removedRoom) {
+        this.destination = destination;
+        this.playerListResponses = playerListResponses;
+        this.systemNoticeResponse = systemNoticeResponse;
+        this.removedRoom = removedRoom;
+    }
+}
diff --git a/backend/src/main/java/io/f1/backend/domain/game/dto/RoomInitialData.java b/backend/src/main/java/io/f1/backend/domain/game/dto/RoomInitialData.java
index ecc16eca..c925b690 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/dto/RoomInitialData.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/dto/RoomInitialData.java
@@ -3,9 +3,11 @@
 import io.f1.backend.domain.game.dto.response.GameSettingResponse;
 import io.f1.backend.domain.game.dto.response.PlayerListResponse;
 import io.f1.backend.domain.game.dto.response.RoomSettingResponse;
+import io.f1.backend.domain.game.dto.response.SystemNoticeResponse;
 
 public record RoomInitialData(
         String destination,
         RoomSettingResponse roomSettingResponse,
         GameSettingResponse gameSettingResponse,
-        PlayerListResponse playerListResponse) {}
+        PlayerListResponse playerListResponse,
+        SystemNoticeResponse systemNoticeResponse) {}
diff --git a/backend/src/main/java/io/f1/backend/domain/game/dto/response/SystemNoticeResponse.java b/backend/src/main/java/io/f1/backend/domain/game/dto/response/SystemNoticeResponse.java
new file mode 100644
index 00000000..911fbf50
--- /dev/null
+++ b/backend/src/main/java/io/f1/backend/domain/game/dto/response/SystemNoticeResponse.java
@@ -0,0 +1,5 @@
+package io.f1.backend.domain.game.dto.response;
+
+import java.time.Instant;
+
+public record SystemNoticeResponse(String noticeMessage, Instant timestamp) {}
diff --git a/backend/src/main/java/io/f1/backend/domain/game/mapper/RoomMapper.java b/backend/src/main/java/io/f1/backend/domain/game/mapper/RoomMapper.java
index 9044c41d..cd3d109f 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/mapper/RoomMapper.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/mapper/RoomMapper.java
@@ -1,5 +1,6 @@
 package io.f1.backend.domain.game.mapper;
 
+import io.f1.backend.domain.game.dto.RoomEventType;
 import io.f1.backend.domain.game.dto.request.RoomCreateRequest;
 import io.f1.backend.domain.game.dto.response.GameSettingResponse;
 import io.f1.backend.domain.game.dto.response.PlayerListResponse;
@@ -7,20 +8,29 @@
 import io.f1.backend.domain.game.dto.response.QuizResponse;
 import io.f1.backend.domain.game.dto.response.RoomResponse;
 import io.f1.backend.domain.game.dto.response.RoomSettingResponse;
+import io.f1.backend.domain.game.dto.response.SystemNoticeResponse;
 import io.f1.backend.domain.game.model.GameSetting;
+import io.f1.backend.domain.game.model.Player;
 import io.f1.backend.domain.game.model.Room;
 import io.f1.backend.domain.game.model.RoomSetting;
 import io.f1.backend.domain.quiz.entity.Quiz;
 
+import java.time.Instant;
 import java.util.List;
 
 public class RoomMapper {
 
+    private static final int DEFAULT_TIME_LIMIT = 60;
+
     public static RoomSetting toRoomSetting(RoomCreateRequest request) {
         return new RoomSetting(
                 request.roomName(), request.maxUserCount(), request.locked(), request.password());
     }
 
+    public static GameSetting toGameSetting(Quiz quiz) {
+        return new GameSetting(quiz.getId(), quiz.getQuestions().size(), DEFAULT_TIME_LIMIT);
+    }
+
     public static RoomSettingResponse toRoomSettingResponse(Room room) {
         return new RoomSettingResponse(
                 room.getRoomSetting().roomName(),
@@ -28,9 +38,9 @@ public static RoomSettingResponse toRoomSettingResponse(Room room) {
                 room.getPlayerSessionMap().size());
     }
 
-    public static GameSettingResponse toGameSettingResponse(
-            GameSetting gameSetting, QuizResponse quiz) {
-        return new GameSettingResponse(gameSetting.getRound(), gameSetting.getTimeLimit(), quiz);
+    public static GameSettingResponse toGameSettingResponse(GameSetting gameSetting, Quiz quiz) {
+        return new GameSettingResponse(
+                gameSetting.getRound(), gameSetting.getTimeLimit(), toQuizResponse(quiz));
     }
 
     public static PlayerListResponse toPlayerListResponse(Room room) {
@@ -56,4 +66,23 @@ public static RoomResponse toRoomResponse(Room room, Quiz quiz) {
                 quiz.getQuestions().size(),
                 quiz.getThumbnailUrl());
     }
+
+    public static QuizResponse toQuizResponse(Quiz quiz) {
+        return new QuizResponse(
+                quiz.getId(),
+                quiz.getTitle(),
+                quiz.getDescription(),
+                quiz.getThumbnailUrl(),
+                quiz.getQuestions().size());
+    }
+
+    public static SystemNoticeResponse ofPlayerEvent(Player player, RoomEventType roomEventType) {
+        String message = "";
+        if (roomEventType == RoomEventType.ENTER) {
+            message = " 님이 입장하셨습니다";
+        } else if (roomEventType == RoomEventType.EXIT) {
+            message = " 님이 퇴장하셨습니다";
+        }
+        return new SystemNoticeResponse(player.getNickname() + message, Instant.now());
+    }
 }
diff --git a/backend/src/main/java/io/f1/backend/domain/game/model/Room.java b/backend/src/main/java/io/f1/backend/domain/game/model/Room.java
index ba0c56b5..00b7e71b 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/model/Room.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/model/Room.java
@@ -35,4 +35,8 @@ public Room(Long id, RoomSetting roomSetting, GameSetting gameSetting, Player ho
         this.gameSetting = gameSetting;
         this.host = host;
     }
+
+    public void updateHost(Player nextHost) {
+        this.host = nextHost;
+    }
 }
diff --git a/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepository.java b/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepository.java
index 83f1b415..6e87760d 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepository.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepository.java
@@ -11,4 +11,6 @@ public interface RoomRepository {
     Optional<Room> findRoom(Long roomId);
 
     List<Room> findAll();
+
+    void removeRoom(Long roomId);
 }
diff --git a/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepositoryImpl.java b/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepositoryImpl.java
index 4daa0a27..cffbba47 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepositoryImpl.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/store/RoomRepositoryImpl.java
@@ -30,6 +30,11 @@ public List<Room> findAll() {
         return new ArrayList<>(roomMap.values());
     }
 
+    @Override
+    public void removeRoom(Long roomId) {
+        roomMap.remove(roomId);
+    }
+
     // 테스트 전용 메소드
     public Room getRoomForTest(Long roomId) {
         return roomMap.get(roomId);
diff --git a/backend/src/main/java/io/f1/backend/domain/game/websocket/GameSocketController.java b/backend/src/main/java/io/f1/backend/domain/game/websocket/GameSocketController.java
index a93f382c..9bf2f17f 100644
--- a/backend/src/main/java/io/f1/backend/domain/game/websocket/GameSocketController.java
+++ b/backend/src/main/java/io/f1/backend/domain/game/websocket/GameSocketController.java
@@ -2,6 +2,7 @@
 
 import io.f1.backend.domain.game.app.RoomService;
 import io.f1.backend.domain.game.dto.MessageType;
+import io.f1.backend.domain.game.dto.RoomExitData;
 import io.f1.backend.domain.game.dto.RoomInitialData;
 
 import lombok.RequiredArgsConstructor;
@@ -22,8 +23,7 @@ public class GameSocketController {
     @MessageMapping("/room/enter/{roomId}")
     public void roomEnter(@DestinationVariable Long roomId, Message<?> message) {
 
-        StompHeaderAccessor accessor = StompHeaderAccessor.wrap(message);
-        String websocketSessionId = accessor.getSessionId();
+        String websocketSessionId = getSessionId(message);
 
         RoomInitialData roomInitialData = roomService.enterRoom(roomId, websocketSessionId);
         String destination = roomInitialData.destination();
@@ -34,5 +34,29 @@ public void roomEnter(@DestinationVariable Long roomId, Message<?> message) {
                 destination, MessageType.GAME_SETTING, roomInitialData.gameSettingResponse());
         messageSender.send(
                 destination, MessageType.PLAYER_LIST, roomInitialData.playerListResponse());
+        messageSender.send(
+                destination, MessageType.SYSTEM_NOTICE, roomInitialData.systemNoticeResponse());
+    }
+
+    @MessageMapping("/room/exit/{roomId}")
+    public void exitRoom(@DestinationVariable Long roomId, Message<?> message) {
+
+        String websocketSessionId = getSessionId(message);
+
+        RoomExitData roomExitData = roomService.exitRoom(roomId, websocketSessionId);
+
+        String destination = roomExitData.getDestination();
+
+        if (!roomExitData.isRemovedRoom()) {
+            messageSender.send(
+                    destination, MessageType.PLAYER_LIST, roomExitData.getPlayerListResponses());
+            messageSender.send(
+                    destination, MessageType.SYSTEM_NOTICE, roomExitData.getSystemNoticeResponse());
+        }
+    }
+
+    private static String getSessionId(Message<?> message) {
+        StompHeaderAccessor accessor = StompHeaderAccessor.wrap(message);
+        return accessor.getSessionId();
     }
 }
diff --git a/backend/src/main/java/io/f1/backend/domain/quiz/app/QuizService.java b/backend/src/main/java/io/f1/backend/domain/quiz/app/QuizService.java
index 94a8dba4..22caf65e 100644
--- a/backend/src/main/java/io/f1/backend/domain/quiz/app/QuizService.java
+++ b/backend/src/main/java/io/f1/backend/domain/quiz/app/QuizService.java
@@ -194,8 +194,16 @@ public QuizListPageResponse getQuizzes(String title, String creator, Pageable pa
 
     @Transactional(readOnly = true)
     public Quiz getQuizById(Long quizId) {
-        return quizRepository
-                .findById(quizId)
-                .orElseThrow(() -> new RuntimeException("E404002: 존재하지 않는 퀴즈입니다."));
+        Quiz quiz =
+                quizRepository
+                        .findById(quizId)
+                        .orElseThrow(() -> new RuntimeException("E404002: 존재하지 않는 퀴즈입니다."));
+        quiz.getQuestions().size();
+        return quiz;
+    }
+
+    @Transactional(readOnly = true)
+    public Long getQuizMinId() {
+        return quizRepository.getQuizMinId();
     }
 }
diff --git a/backend/src/main/java/io/f1/backend/domain/quiz/dao/QuizRepository.java b/backend/src/main/java/io/f1/backend/domain/quiz/dao/QuizRepository.java
index 82b6bd16..d5021088 100644
--- a/backend/src/main/java/io/f1/backend/domain/quiz/dao/QuizRepository.java
+++ b/backend/src/main/java/io/f1/backend/domain/quiz/dao/QuizRepository.java
@@ -5,10 +5,14 @@
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 
 public interface QuizRepository extends JpaRepository<Quiz, Long> {
 
     Page<Quiz> findQuizzesByTitleContaining(String title, Pageable pageable);
 
     Page<Quiz> findQuizzesByCreator_NicknameContaining(String creator, Pageable pageable);
+
+    @Query("SELECT MIN(q.id) FROM Quiz q")
+    Long getQuizMinId();
 }