diff --git a/src/main/java/com/example/swiftgathering_server/controller/GatheringSessionController.java b/src/main/java/com/example/swiftgathering_server/controller/GatheringSessionController.java
index be54afd..1f335de 100644
--- a/src/main/java/com/example/swiftgathering_server/controller/GatheringSessionController.java
+++ b/src/main/java/com/example/swiftgathering_server/controller/GatheringSessionController.java
@@ -1,7 +1,7 @@
 package com.example.swiftgathering_server.controller;
 
 import com.example.swiftgathering_server.dto.CreateSessionRequestDto;
-import com.example.swiftgathering_server.dto.EndSessionRequestDto;
+import com.example.swiftgathering_server.dto.ParticipateSessionRequestDto;
 import com.example.swiftgathering_server.service.GatheringSessionService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
@@ -20,9 +20,9 @@ public ResponseEntity<Void> createSession(@RequestBody CreateSessionRequestDto r
         return ResponseEntity.ok().build();
     }
 
-    @PatchMapping("/{id}")
-    public ResponseEntity<Void> endSession(@PathVariable Long id, @RequestBody EndSessionRequestDto requestDto) {
-        gatheringSessionService.endSession(id, requestDto);
+    @PatchMapping
+    public ResponseEntity<Void> participateSession(@RequestBody ParticipateSessionRequestDto participateSessionRequestDto) {
+        gatheringSessionService.participateSession(participateSessionRequestDto);
         return ResponseEntity.ok().build();
     }
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/swiftgathering_server/domain/GatheringSession.java b/src/main/java/com/example/swiftgathering_server/domain/GatheringSession.java
index 4ca8276..2b34880 100644
--- a/src/main/java/com/example/swiftgathering_server/domain/GatheringSession.java
+++ b/src/main/java/com/example/swiftgathering_server/domain/GatheringSession.java
@@ -7,6 +7,7 @@
 import lombok.NoArgsConstructor;
 
 import java.time.LocalDateTime;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
 
@@ -21,10 +22,9 @@ public class GatheringSession {
 
     private UUID sessionId = UUID.randomUUID();
     private LocalDateTime createdTime;
-    private LocalDateTime endedTime;
 
-    @OneToMany(mappedBy = "gatheringSession", cascade = CascadeType.ALL)
-    private List<GatheringSessionMember> gatheringSessionMembers;
+    @ElementCollection
+    private List<GatheringSessionMember> gatheringSessionMembers = new ArrayList<>();
 
     @OneToMany(mappedBy = "gatheringSession", cascade = CascadeType.ALL)
     private List<FlagLocation> locations;
@@ -34,9 +34,4 @@ public GatheringSession(List<GatheringSessionMember> gatheringSessionMembers, Lo
         this.gatheringSessionMembers = gatheringSessionMembers;
         this.createdTime = createdTime;
     }
-
-    public void endSession(LocalDateTime endedTime, List<FlagLocation> locations) {
-        this.endedTime = endedTime;
-        this.locations = locations;
-    }
 }
diff --git a/src/main/java/com/example/swiftgathering_server/domain/GatheringSessionMember.java b/src/main/java/com/example/swiftgathering_server/domain/GatheringSessionMember.java
index 9ff7804..ab97636 100644
--- a/src/main/java/com/example/swiftgathering_server/domain/GatheringSessionMember.java
+++ b/src/main/java/com/example/swiftgathering_server/domain/GatheringSessionMember.java
@@ -6,26 +6,22 @@
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 
-@Entity
 @Getter
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Embeddable
 public class GatheringSessionMember {
+    private Long memberId;
 
-    @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    private Long id;
-
-    @ManyToOne
-    @JoinColumn(name = "gathering_session_id")
-    private GatheringSession gatheringSession;
-
-    @ManyToOne
-    @JoinColumn(name = "member_id")
-    private Member member;
+    @Enumerated(EnumType.STRING)
+    private GatheringSessionMemberStatus status;
 
     @Builder
-    public GatheringSessionMember(GatheringSession gatheringSession, Member member) {
-        this.gatheringSession = gatheringSession;
-        this.member = member;
+    public GatheringSessionMember(Long memberId, GatheringSessionMemberStatus status) {
+        this.memberId = memberId;
+        this.status = status;
+    }
+
+    public void setStatus(GatheringSessionMemberStatus status) {
+        this.status = status;
     }
 }
diff --git a/src/main/java/com/example/swiftgathering_server/domain/GatheringSessionMemberStatus.java b/src/main/java/com/example/swiftgathering_server/domain/GatheringSessionMemberStatus.java
new file mode 100644
index 0000000..214f9d2
--- /dev/null
+++ b/src/main/java/com/example/swiftgathering_server/domain/GatheringSessionMemberStatus.java
@@ -0,0 +1,5 @@
+package com.example.swiftgathering_server.domain;
+
+public enum GatheringSessionMemberStatus {
+    INVITED, PARTICIPATED
+}
diff --git a/src/main/java/com/example/swiftgathering_server/dto/CreateSessionRequestDto.java b/src/main/java/com/example/swiftgathering_server/dto/CreateSessionRequestDto.java
index c38a8be..dfbeeaf 100644
--- a/src/main/java/com/example/swiftgathering_server/dto/CreateSessionRequestDto.java
+++ b/src/main/java/com/example/swiftgathering_server/dto/CreateSessionRequestDto.java
@@ -1,11 +1,11 @@
 package com.example.swiftgathering_server.dto;
 
-import com.example.swiftgathering_server.domain.GatheringSessionMember;
 import lombok.Getter;
 
 import java.util.List;
 
 @Getter
 public class CreateSessionRequestDto {
-    private List<GatheringSessionMember> members;
+    private Long senderId;
+    private List<Long> guestIds;
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/swiftgathering_server/dto/EndSessionRequestDto.java b/src/main/java/com/example/swiftgathering_server/dto/EndSessionRequestDto.java
deleted file mode 100644
index c94aa09..0000000
--- a/src/main/java/com/example/swiftgathering_server/dto/EndSessionRequestDto.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.example.swiftgathering_server.dto;
-
-
-import com.example.swiftgathering_server.domain.FlagLocation;
-import lombok.Getter;
-
-import java.util.List;
-
-@Getter
-public class EndSessionRequestDto {
-    private List<FlagLocation> flagLocations;
-}
diff --git a/src/main/java/com/example/swiftgathering_server/dto/GatheringSessionNotificationDto.java b/src/main/java/com/example/swiftgathering_server/dto/GatheringSessionNotificationDto.java
index aadbb91..fd749b2 100644
--- a/src/main/java/com/example/swiftgathering_server/dto/GatheringSessionNotificationDto.java
+++ b/src/main/java/com/example/swiftgathering_server/dto/GatheringSessionNotificationDto.java
@@ -6,11 +6,11 @@
 
 @Getter
 public class GatheringSessionNotificationDto {
-    private Long sessionId;
-    private List<Long> memberIds;
+    final private Long sessionId;
+    final private List<Long> participantIds;
 
-    public GatheringSessionNotificationDto(Long sessionId, List<Long> memberIds) {
+    public GatheringSessionNotificationDto(Long sessionId, List<Long> participantIds) {
         this.sessionId = sessionId;
-        this.memberIds = memberIds;
+        this.participantIds = participantIds;
     }
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/swiftgathering_server/dto/ParticipateSessionRequestDto.java b/src/main/java/com/example/swiftgathering_server/dto/ParticipateSessionRequestDto.java
new file mode 100644
index 0000000..ac215b5
--- /dev/null
+++ b/src/main/java/com/example/swiftgathering_server/dto/ParticipateSessionRequestDto.java
@@ -0,0 +1,9 @@
+package com.example.swiftgathering_server.dto;
+
+import lombok.Getter;
+
+@Getter
+public class ParticipateSessionRequestDto {
+    private Long sessionId;
+    private Long memberId;
+}
diff --git a/src/main/java/com/example/swiftgathering_server/repository/FriendRequestRepository.java b/src/main/java/com/example/swiftgathering_server/repository/FriendRequestRepository.java
index 4e9fbcf..231ed17 100644
--- a/src/main/java/com/example/swiftgathering_server/repository/FriendRequestRepository.java
+++ b/src/main/java/com/example/swiftgathering_server/repository/FriendRequestRepository.java
@@ -1,6 +1,7 @@
 package com.example.swiftgathering_server.repository;
 
 import com.example.swiftgathering_server.domain.FriendRequest;
+import com.example.swiftgathering_server.domain.Friendship;
 import com.example.swiftgathering_server.domain.Member;
 import jakarta.persistence.EntityManager;
 import lombok.RequiredArgsConstructor;
@@ -20,6 +21,10 @@ public Long save(FriendRequest friendRequest) {
         return friendRequest.getId();
     }
 
+    public void update(FriendRequest friendRequest) {
+        em.merge(friendRequest);
+    }
+
     public Optional<FriendRequest> findById(Long requestId) {
         FriendRequest friendRequest = em.find(FriendRequest.class, requestId);
         return Optional.of(friendRequest);
diff --git a/src/main/java/com/example/swiftgathering_server/repository/GatheringSessionRepository.java b/src/main/java/com/example/swiftgathering_server/repository/GatheringSessionRepository.java
index 3b60e91..a4b5716 100644
--- a/src/main/java/com/example/swiftgathering_server/repository/GatheringSessionRepository.java
+++ b/src/main/java/com/example/swiftgathering_server/repository/GatheringSessionRepository.java
@@ -18,6 +18,10 @@ public GatheringSession save(GatheringSession gatheringSession) {
         return gatheringSession;
     }
 
+    public GatheringSession update(GatheringSession gatheringSession) {
+        return em.merge(gatheringSession);
+    }
+
     public Optional<GatheringSession> findById(Long id) {
         GatheringSession gatheringSession = em.find(GatheringSession.class, id);
         return Optional.of(gatheringSession);
diff --git a/src/main/java/com/example/swiftgathering_server/repository/MemberRepository.java b/src/main/java/com/example/swiftgathering_server/repository/MemberRepository.java
index 82c2f02..4c35d15 100644
--- a/src/main/java/com/example/swiftgathering_server/repository/MemberRepository.java
+++ b/src/main/java/com/example/swiftgathering_server/repository/MemberRepository.java
@@ -5,6 +5,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
 import java.util.Optional;
 
 @Repository
@@ -31,6 +32,12 @@ public Optional<Member> findByLoginUsername(String loginUsername) {
                 .findAny();
     }
 
+    public List<Member> findAllByIds(List<Long> ids) {
+        return em.createQuery("select m from Member m where m.id in :ids", Member.class)
+                .setParameter("ids", ids)
+                .getResultList();
+    }
+
     public void remove(Member member) {
         em.remove(member);
     }
diff --git a/src/main/java/com/example/swiftgathering_server/service/FriendRequestService.java b/src/main/java/com/example/swiftgathering_server/service/FriendRequestService.java
index 9b538d9..92d82f4 100644
--- a/src/main/java/com/example/swiftgathering_server/service/FriendRequestService.java
+++ b/src/main/java/com/example/swiftgathering_server/service/FriendRequestService.java
@@ -64,6 +64,6 @@ public void updateFriendRequestStatus(Long memberId, FriendRequestUpdateDto frie
         } else {
             friendRequest.setRequestStatus(false);
         }
-        friendRequestRepository.save(friendRequest);
+        friendRequestRepository.update(friendRequest);
     }
 }
diff --git a/src/main/java/com/example/swiftgathering_server/service/GatheringSessionService.java b/src/main/java/com/example/swiftgathering_server/service/GatheringSessionService.java
index a7400ba..5d26c31 100644
--- a/src/main/java/com/example/swiftgathering_server/service/GatheringSessionService.java
+++ b/src/main/java/com/example/swiftgathering_server/service/GatheringSessionService.java
@@ -1,14 +1,12 @@
 package com.example.swiftgathering_server.service;
 
-import com.example.swiftgathering_server.domain.FlagLocation;
-import com.example.swiftgathering_server.domain.GatheringSession;
-import com.example.swiftgathering_server.domain.GatheringSessionMember;
-import com.example.swiftgathering_server.domain.Member;
+import com.example.swiftgathering_server.domain.*;
 import com.example.swiftgathering_server.dto.CreateSessionRequestDto;
-import com.example.swiftgathering_server.dto.EndSessionRequestDto;
 import com.example.swiftgathering_server.dto.GatheringSessionNotificationDto;
-import com.example.swiftgathering_server.repository.FlagLocationRepository;
+import com.example.swiftgathering_server.dto.ParticipateSessionRequestDto;
+import com.example.swiftgathering_server.exception.ResourceNotFoundException;
 import com.example.swiftgathering_server.repository.GatheringSessionRepository;
+import com.example.swiftgathering_server.repository.MemberRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.amqp.core.Binding;
 import org.springframework.amqp.core.BindingBuilder;
@@ -20,7 +18,6 @@
 
 import java.time.LocalDateTime;
 import java.util.List;
-import java.util.NoSuchElementException;
 import java.util.stream.Collectors;
 
 @Service
@@ -28,63 +25,56 @@
 @RequiredArgsConstructor
 public class GatheringSessionService {
 
+    private final MemberRepository memberRepository;
     private final GatheringSessionRepository gatheringSessionRepository;
-    private final FlagLocationRepository flagLocationRepository;
+//    private final FlagLocationRepository flagLocationRepository;
     private final AmqpTemplate amqpTemplate;
 
     public void createSession(CreateSessionRequestDto requestDto) {
-        List<GatheringSessionMember> members = requestDto.getMembers();
+        List<GatheringSessionMember> sessionMembers = memberRepository
+                .findAllByIds(requestDto.getGuestIds()).stream()
+                .map(member -> GatheringSessionMember.builder()
+                        .memberId(member.getId())
+                        .status(GatheringSessionMemberStatus.INVITED)
+                        .build())
+                .collect(Collectors.toList());
+
         LocalDateTime createdTime = LocalDateTime.now();
         GatheringSession session = GatheringSession.builder()
-                .gatheringSessionMembers(members)
+                .gatheringSessionMembers(sessionMembers)
                 .createdTime(createdTime)
                 .build();
-        GatheringSession sessionId = gatheringSessionRepository.save(session);
-        notifyClients(sessionId);
-        return;
-    }
-
-    public void endSession(Long sessionId, EndSessionRequestDto requestDto) {
-        GatheringSession session = gatheringSessionRepository.findById(sessionId)
-                .orElseThrow(() -> new NoSuchElementException("Session not found"));
-
-        LocalDateTime endedTime = LocalDateTime.now();
 
-        List<FlagLocation> flagLocations = requestDto.getFlagLocations().stream()
-                .map(dto -> FlagLocation.builder()
-                        .latitude(dto.getLatitude())
-                        .longitude(dto.getLongitude())
-                        .name(dto.getName())
-                        .createdTime(dto.getCreatedTime() != null ? dto.getCreatedTime() : LocalDateTime.now())
-                        .gatheringSession(session)
-                        .build())
-                .collect(Collectors.toList());
+        GatheringSession savedSession = gatheringSessionRepository.save(session);
+        notifyClients(savedSession);
+    }
 
-        session.endSession(endedTime, flagLocations);
+    public void participateSession(ParticipateSessionRequestDto requestDto) {
+        GatheringSession session = gatheringSessionRepository.findById(requestDto.getSessionId())
+                .orElseThrow(() -> new ResourceNotFoundException("Session not found"));
 
-        flagLocationRepository.saveAll(flagLocations);
+        session.getGatheringSessionMembers().stream()
+                .filter(member -> member.getMemberId().equals(requestDto.getMemberId()))
+                .findFirst()
+                .ifPresentOrElse(
+                        member -> member.setStatus(GatheringSessionMemberStatus.PARTICIPATED),
+                        () -> {
+                            throw new IllegalStateException("Member not invited to the session");
+                        });
 
-        gatheringSessionRepository.save(session);
-        return;
+        gatheringSessionRepository.update(session);
     }
 
     private void notifyClients(GatheringSession session) {
         List<Long> memberIds = session.getGatheringSessionMembers().stream()
-                .map(GatheringSessionMember::getMember)
-                .map(Member::getId)
+                .map(GatheringSessionMember::getMemberId)
                 .collect(Collectors.toList());
 
         for (Long memberId : memberIds) {
             Queue queue = new Queue("swift-gathering.queue." + memberId, false);
             DirectExchange exchange = new DirectExchange("swift-gathering.exchange." + memberId);
             Binding binding = BindingBuilder.bind(queue).to(exchange).with("swift-gathering.routing." + memberId);
-
-//            rabbitAdmin.declareQueue(queue);
-//            rabbitAdmin.declareExchange(exchange);
-//            rabbitAdmin.declareBinding(binding);
-
             GatheringSessionNotificationDto notification = new GatheringSessionNotificationDto(session.getId(), memberIds);
-
             amqpTemplate.convertAndSend(exchange.getName(), binding.getRoutingKey(), notification);
         }
     }