diff --git a/Realtime/Internal/Controller/LCIMMessageController.cs b/Realtime/Internal/Controller/LCIMMessageController.cs
index dbfd49b..8378080 100644
--- a/Realtime/Internal/Controller/LCIMMessageController.cs
+++ b/Realtime/Internal/Controller/LCIMMessageController.cs
@@ -158,7 +158,7 @@ namespace LeanCloud.Realtime.Internal.Controller {
             request.LogsMessage = logs;
             GenericCommand response = await Client.Connection.SendRequest(request);
             // 反序列化聊天记录
-            ReadOnlyCollection<LCIMMessage> messages = response.LogsMessage.Logs.Select(item => {
+            return response.LogsMessage.Logs.Select(item => {
                 LCIMMessage message;
                 if (item.Bin) {
                     // 二进制消息
@@ -179,14 +179,6 @@ namespace LeanCloud.Realtime.Internal.Controller {
                 message.MentionIdList = item.MentionPids.ToList();
                 return message;
             }).ToList().AsReadOnly();
-            // 查询之后更新对话中的最后一条消息
-            LCIMMessage lastMessage = messages.Last();
-            LCIMConversation conversation = await Client.GetOrQueryConversation(convId);
-            if (conversation.LastMessage == null ||
-                conversation.LastMessage.SentTimestamp < lastMessage.SentTimestamp) {
-                conversation.LastMessage = lastMessage;
-            }
-            return messages;
         }
 
         /// <summary>
diff --git a/Test/Realtime.Test/Message.cs b/Test/Realtime.Test/Message.cs
index 47d2494..3d0c2cc 100644
--- a/Test/Realtime.Test/Message.cs
+++ b/Test/Realtime.Test/Message.cs
@@ -1,4 +1,5 @@
 using NUnit.Framework;
+using System;
 using System.Collections.ObjectModel;
 using System.Threading.Tasks;
 using LeanCloud;
@@ -145,5 +146,30 @@ namespace Realtime.Test {
                 WriteLine(message.Id);
             }
         }
+
+        [Test]
+        [Order(5)]
+        public async Task Unread() {
+            TaskCompletionSource<object> tcs = new TaskCompletionSource<object>();
+            string clientId = Guid.NewGuid().ToString();
+            LCIMClient client = new LCIMClient(clientId);
+            LCIMConversation conversation = await m1.CreateConversation(new string[] { clientId });
+            await client.Open();
+            LCIMTextMessage textMessage = new LCIMTextMessage("hello");
+            await conversation.Send(textMessage);
+            client.OnUnreadMessagesCountUpdated = (convs) => {
+                foreach (LCIMConversation conv in convs) {
+                    WriteLine($"unread count: {conv.Unread}");
+                    Assert.AreEqual(conv.Unread, 1);
+                    Assert.True(conv.LastMessage is LCIMTextMessage);
+                    LCIMTextMessage textMsg = conv.LastMessage as LCIMTextMessage;
+                    Assert.AreEqual(textMsg.Text, "hello");
+                    tcs.SetResult(true);
+                }
+            };
+            await client.Open();
+
+            await tcs.Task;
+        }
     }
 }