diff --git a/ClientTester/EchoClientTester/Packet/PacketBody.cs b/ClientTester/EchoClientTester/Packet/PacketBody.cs
index b58cb7d..d47f2a2 100644
--- a/ClientTester/EchoClientTester/Packet/PacketBody.cs
+++ b/ClientTester/EchoClientTester/Packet/PacketBody.cs
@@ -663,7 +663,9 @@ public enum PartyUpdateType
     DELETE,
     JOIN,
     LEAVE,
-    UPDATE
+    UPDATE,
+    INVITE,
+    KICK
 }
 
 // REQUEST_PARTY (클라 -> 서버) - CREATE: PartyName 사용 / JOIN·LEAVE·DELETE: PartyId 사용
diff --git a/MMOTestServer/MMOserver/Api/RestApi.cs b/MMOTestServer/MMOserver/Api/RestApi.cs
index 91d26cc..f50c94f 100644
--- a/MMOTestServer/MMOserver/Api/RestApi.cs
+++ b/MMOTestServer/MMOserver/Api/RestApi.cs
@@ -129,6 +129,18 @@ public class RestApi : Singleton<RestApi>
 
         [JsonPropertyName("sprintMultiplier")]
         public double SprintMultiplier { get; set; }
+
+        [JsonPropertyName("lastPosX")]
+        public double LastPosX { get; set; }
+
+        [JsonPropertyName("lastPosY")]
+        public double LastPosY { get; set; }
+
+        [JsonPropertyName("lastPosZ")]
+        public double LastPosZ { get; set; }
+
+        [JsonPropertyName("lastRotY")]
+        public double LastRotY { get; set; }
     }
 
     // 레이드 채널 접속 여부 체크
@@ -192,6 +204,39 @@ public class RestApi : Singleton<RestApi>
         return null;
     }
 
+    // 게임 데이터 저장 (채널 퇴장 시 위치/플레이타임 저장)
+    public async Task<bool> SaveGameDataAsync(string username, float? posX, float? posY, float? posZ, float? rotY, long? playTimeDelta)
+    {
+        string url = AppConfig.RestApi.BaseUrl + "/api/internal/player/save?username=" + Uri.EscapeDataString(username);
+
+        var body = new Dictionary<string, object?>();
+        if (posX.HasValue) body["lastPosX"] = posX.Value;
+        if (posY.HasValue) body["lastPosY"] = posY.Value;
+        if (posZ.HasValue) body["lastPosZ"] = posZ.Value;
+        if (rotY.HasValue) body["lastRotY"] = rotY.Value;
+        if (playTimeDelta.HasValue) body["playTimeDelta"] = playTimeDelta.Value;
+
+        for (int attempt = 1; attempt <= MAX_RETRY; attempt++)
+        {
+            try
+            {
+                HttpResponseMessage response = await httpClient.PostAsJsonAsync(url, body);
+                response.EnsureSuccessStatusCode();
+                return true;
+            }
+            catch (Exception ex) when (attempt < MAX_RETRY)
+            {
+                Log.Warning("[RestApi] 게임 데이터 저장 실패 (시도 {Attempt}/{Max}): {Message}", attempt, MAX_RETRY, ex.Message);
+                await Task.Delay(RETRY_DELAY);
+            }
+            catch (Exception ex)
+            {
+                Log.Error("[RestApi] 게임 데이터 저장 최종 실패 ({Max}회 시도): {Message}", MAX_RETRY, ex.Message);
+            }
+        }
+        return false;
+    }
+
     private sealed class BossRaidAccessResponse
     {
         [JsonPropertyName("roomId")]
diff --git a/MMOTestServer/MMOserver/Game/Channel/Channel.cs b/MMOTestServer/MMOserver/Game/Channel/Channel.cs
index 386a636..0b0c2cd 100644
--- a/MMOTestServer/MMOserver/Game/Channel/Channel.cs
+++ b/MMOTestServer/MMOserver/Game/Channel/Channel.cs
@@ -137,6 +137,13 @@ public class Channel
         return player;
     }
 
+    // 특정 유저의 NetPeer 반환
+    public NetPeer? GetPeer(int userId)
+    {
+        connectPeers.TryGetValue(userId, out NetPeer? peer);
+        return peer;
+    }
+
     public int HasUser(int userId)
     {
         if (connectUsers.ContainsKey(userId))
diff --git a/MMOTestServer/MMOserver/Game/GameServer.cs b/MMOTestServer/MMOserver/Game/GameServer.cs
index 87df97f..5fa6e92 100644
--- a/MMOTestServer/MMOserver/Game/GameServer.cs
+++ b/MMOTestServer/MMOserver/Game/GameServer.cs
@@ -207,6 +207,21 @@ public class GameServer : ServerBase
         int channelId = cm.HasUser(hashKey);
         Player? player = channelId >= 0 ? cm.GetChannel(channelId).GetPlayer(hashKey) : null;
 
+        // 퇴장 시 위치/플레이타임 DB 저장 (fire-and-forget)
+        if (player != null && peer.Tag is Session session && session.Username != null)
+        {
+            long playTimeDelta = 0;
+            if (session.ChannelJoinedAt != default)
+            {
+                playTimeDelta = (long)(DateTime.UtcNow - session.ChannelJoinedAt).TotalSeconds;
+            }
+            _ = RestApi.Instance.SaveGameDataAsync(
+                session.Username,
+                player.PosX, player.PosY, player.PosZ, player.RotY,
+                playTimeDelta > 0 ? playTimeDelta : null
+            );
+        }
+
         if (cm.RemoveUser(hashKey))
         {
             Log.Information("[GameServer] 세션 해제 HashKey={Key} Reason={Reason}", hashKey, info.Reason);
@@ -524,6 +539,10 @@ public class GameServer : ServerBase
                     newPlayer.AttackPower = (float)profile.AttackPower;
                     newPlayer.AttackRange = (float)profile.AttackRange;
                     newPlayer.SprintMultiplier = (float)profile.SprintMultiplier;
+                    newPlayer.PosX = (float)profile.LastPosX;
+                    newPlayer.PosY = (float)profile.LastPosY;
+                    newPlayer.PosZ = (float)profile.LastPosZ;
+                    newPlayer.RotY = (float)profile.LastRotY;
                     Log.Information("[GameServer] 프로필 로드 완료 Username={Username} Level={Level} MaxHp={MaxHp}",
                         username, profile.Level, profile.MaxHp);
                 }
@@ -540,6 +559,10 @@ public class GameServer : ServerBase
             }
         }
 
+        // 채널 입장 시각 기록 (플레이타임 계산용)
+        ((Session)peer.Tag).ChannelJoinedAt = DateTime.UtcNow;
+
+        // 채널에 추가
         cm.AddUser(packet.ChannelId, hashKey, newPlayer, peer);
         Log.Debug("[GameServer] INTO_CHANNEL HashKey={Key} ChannelId={ChannelId}", hashKey, packet.ChannelId);
 
@@ -921,6 +944,84 @@ public class GameServer : ServerBase
                 BroadcastToChannel(channelId, data); // 채널 전체 파티 목록 갱신
                 break;
             }
+            case PartyUpdateType.INVITE:
+            {
+                // 리더만 초대 가능
+                PartyInfo? myParty = pm.GetPartyByPlayer(hashKey);
+                if (myParty == null || myParty.LeaderId != hashKey)
+                {
+                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
+                    return;
+                }
+
+                if (myParty.GetPartyMemberCount() >= PartyInfo.partyMemberMax)
+                {
+                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
+                    return;
+                }
+
+                // 대상 플레이어가 같은 채널에 있는지 확인
+                int targetId = req.TargetPlayerId;
+                Channel.Channel? ch = cm.GetChannel(channelId);
+                if (ch == null || ch.GetPlayer(targetId) == null)
+                {
+                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
+                    return;
+                }
+
+                // 대상에게 초대 알림 전송
+                NetPeer? targetPeer = ch.GetPeer(targetId);
+                if (targetPeer == null)
+                {
+                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
+                    return;
+                }
+
+                UpdatePartyPacket inviteNotify = new()
+                {
+                    PartyId = myParty.PartyId,
+                    Type = PartyUpdateType.INVITE,
+                    LeaderId = hashKey,
+                    PlayerId = targetId,
+                    PartyName = myParty.PartyName
+                };
+                byte[] inviteData = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, inviteNotify);
+                SendTo(targetPeer, inviteData);
+                break;
+            }
+            case PartyUpdateType.KICK:
+            {
+                // 리더만 추방 가능
+                PartyInfo? myParty2 = pm.GetPartyByPlayer(hashKey);
+                if (myParty2 == null || myParty2.LeaderId != hashKey)
+                {
+                    SendError(peer, ErrorCode.PARTY_DELETE_FAILED);
+                    return;
+                }
+
+                int kickTarget = req.TargetPlayerId;
+                if (kickTarget == hashKey)
+                {
+                    return; // 자기 자신은 추방 불가
+                }
+
+                if (!pm.LeaveParty(kickTarget, out PartyInfo? kickedParty) || kickedParty == null)
+                {
+                    SendError(peer, ErrorCode.PARTY_NOT_IN_PARTY);
+                    return;
+                }
+
+                UpdatePartyPacket kickNotify = new()
+                {
+                    PartyId = kickedParty.PartyId,
+                    Type = PartyUpdateType.KICK,
+                    LeaderId = kickedParty.LeaderId,
+                    PlayerId = kickTarget
+                };
+                byte[] kickData = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, kickNotify);
+                BroadcastToChannel(channelId, kickData);
+                break;
+            }
         }
     }
 
diff --git a/MMOTestServer/MMOserver/Game/Player.cs b/MMOTestServer/MMOserver/Game/Player.cs
index da75369..583ec1f 100644
--- a/MMOTestServer/MMOserver/Game/Player.cs
+++ b/MMOTestServer/MMOserver/Game/Player.cs
@@ -118,4 +118,5 @@ public class Player
         get;
         set;
     }
+
 }
diff --git a/MMOTestServer/MMOserver/Packet/PacketBody.cs b/MMOTestServer/MMOserver/Packet/PacketBody.cs
index 572d160..babf7c6 100644
--- a/MMOTestServer/MMOserver/Packet/PacketBody.cs
+++ b/MMOTestServer/MMOserver/Packet/PacketBody.cs
@@ -661,7 +661,9 @@ public enum PartyUpdateType
     DELETE,
     JOIN,
     LEAVE,
-    UPDATE
+    UPDATE,
+    INVITE,  // 리더가 대상 플레이어에게 초대 전송
+    KICK     // 리더가 파티원을 추방
 }
 
 // REQUEST_PARTY (클라 -> 서버) - CREATE: PartyName 사용 / JOIN·LEAVE·DELETE: PartyId 사용
@@ -688,6 +690,13 @@ public class RequestPartyPacket
         get;
         set;
     } // CREATE 시 사용
+
+    [ProtoMember(4)]
+    public int TargetPlayerId
+    {
+        get;
+        set;
+    } // INVITE, KICK 시 사용
 }
 
 // ============================================================
diff --git a/MMOTestServer/ServerLib/Service/Session.cs b/MMOTestServer/ServerLib/Service/Session.cs
index 9e3e7de..0afec93 100644
--- a/MMOTestServer/ServerLib/Service/Session.cs
+++ b/MMOTestServer/ServerLib/Service/Session.cs
@@ -67,6 +67,9 @@ public class Session
         RateLimitViolations = 0;
     }
 
+    // 채널 입장 시각 (플레이타임 계산용)
+    public DateTime ChannelJoinedAt { get; set; }
+
     public Session(int hashKey, NetPeer peer, int maxPacketsPerSecond = 60)
     {
         HashKey = hashKey;