diff --git a/Common/Database/ClientData.cs b/Common/Database/ClientData.cs
new file mode 100644
index 0000000..67bc5f3
--- /dev/null
+++ b/Common/Database/ClientData.cs
@@ -0,0 +1,31 @@
+using Common.Resources.Proto;
+using MongoDB.Bson;
+using MongoDB.Driver;
+
+namespace Common.Database
+{
+    public class ClientData
+    {
+        public static readonly IMongoCollection<ClientDataScheme> collection = Global.db.GetCollection<ClientDataScheme>("ClientDatas");
+
+        public static ClientDataScheme? GetClientData(uint uid, ClientDataType type, uint id)
+        {
+            return collection.AsQueryable().Where(c => c.OwnerUid == uid && c.Type == type && c.ClientDataId == id).FirstOrDefault();
+        }
+
+        public static void SetClientData(uint uid, ClientDataType type, uint id, byte[] data)
+        {
+            collection.UpdateOne(Builders<ClientDataScheme>.Filter.Where(c => c.OwnerUid == uid && c.Type == type && c.ClientDataId == id), Builders<ClientDataScheme>.Update.Set("Type", type).Set("ClientDataId", id).Set("Data", data).SetOnInsert("OwnerUid", uid), new UpdateOptions() { IsUpsert = true });
+        }
+    }
+
+#pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+    public class ClientDataScheme
+    {
+        public ObjectId Id { get; set; }
+        public uint OwnerUid { get; set; }
+        public ClientDataType Type { get; set; }
+        public uint ClientDataId { get; set; }
+        public byte[] Data { get; set; }
+    }
+}
diff --git a/GameServer/Handlers/GetClientDataReqHandler.cs b/GameServer/Handlers/GetClientDataReqHandler.cs
index e96483f..9b86360 100644
--- a/GameServer/Handlers/GetClientDataReqHandler.cs
+++ b/GameServer/Handlers/GetClientDataReqHandler.cs
@@ -1,4 +1,5 @@
-using Common.Resources.Proto;
+using Common.Database;
+using Common.Resources.Proto;
 
 namespace PemukulPaku.GameServer.Handlers
 {
@@ -8,8 +9,24 @@ namespace PemukulPaku.GameServer.Handlers
         public void Handle(Session session, Packet packet)
         {
             GetClientDataReq Data = packet.GetDecodedBody<GetClientDataReq>();
+            ClientDataScheme? clientData = Common.Database.ClientData.GetClientData(session.Player.User.Uid, Data.Type, Data.Id);
+            GetClientDataRsp Rsp = new() { retcode = GetClientDataRsp.Retcode.Succ, Id = Data.Id, Type = Data.Type };
 
-            session.Send(Packet.FromProto(new GetClientDataRsp() { retcode = GetClientDataRsp.Retcode.NotFound, Type = Data.Type, Id = Data.Id }, CmdId.GetClientDataRsp));
+            if (clientData is not null)
+            {
+                Rsp.ClientDataLists.Add(new()
+                {
+                    Id = clientData.ClientDataId,
+                    Type = clientData.Type,
+                    Data = clientData.Data
+                });
+            }
+            else
+            {
+                Rsp.retcode = GetClientDataRsp.Retcode.NotFound;
+            }
+
+            session.Send(Packet.FromProto(Rsp, CmdId.GetClientDataRsp));
         }
     }
 }
diff --git a/GameServer/Handlers/SetClientDataReqHandler.cs b/GameServer/Handlers/SetClientDataReqHandler.cs
new file mode 100644
index 0000000..f18c469
--- /dev/null
+++ b/GameServer/Handlers/SetClientDataReqHandler.cs
@@ -0,0 +1,17 @@
+using Common.Database;
+using Common.Resources.Proto;
+
+namespace PemukulPaku.GameServer.Handlers
+{
+    [PacketCmdId(CmdId.SetClientDataReq)]
+    internal class SetClientDataReqHandler : IPacketHandler
+    {
+        public void Handle(Session session, Packet packet)
+        {
+            SetClientDataReq Data = packet.GetDecodedBody<SetClientDataReq>();
+            Common.Database.ClientData.SetClientData(session.Player.User.Uid, Data.ClientData.Type, Data.ClientData.Id, Data.ClientData.Data);
+
+            session.Send(Packet.FromProto(new SetClientDataRsp() { retcode = SetClientDataRsp.Retcode.Succ, Id = Data.ClientData.Id, Type = Data.ClientData.Type }, CmdId.SetClientDataRsp));
+        }
+    }
+}