diff --git a/src/main/java/com/github/jie65535/openchat/EventListeners.java b/src/main/java/com/github/jie65535/openchat/EventListeners.java
index 3ea9cb5..06a3da6 100644
--- a/src/main/java/com/github/jie65535/openchat/EventListeners.java
+++ b/src/main/java/com/github/jie65535/openchat/EventListeners.java
@@ -1,23 +1,44 @@
+/*
+ * gc-openchat
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.openchat;
 
-import emu.grasscutter.server.event.player.PlayerJoinEvent;
+//import emu.grasscutter.server.event.player.PlayerJoinEvent;
+//import emu.grasscutter.server.scheduler.ServerTaskScheduler;
 
-public final class EventListeners {
-    private static final OpenChatPlugin plugin = OpenChatPlugin.getInstance();
-    private static final OpenChatConfig config = OpenChatPlugin.getInstance().getConfig();
+//public final class EventListeners {
+//    private static final OpenChatPlugin plugin = OpenChatPlugin.getInstance();
+//    private static final OpenChatConfig config = OpenChatPlugin.getInstance().getConfig();
 
-    public static void onJoin(PlayerJoinEvent event) {
-        // 检查聊天系统是否被其它插件替换
-        // 不再检查
-//        if (!(plugin.getServer().getChatSystem() instanceof OpenChatSystem)) {
-//            plugin.getLogger().warn("聊天系统已被其它插件更改，现已重置为 OpenChat !");
-//            plugin.getServer().setChatSystem(new OpenChatSystem(plugin));
-//        }
-
-        if (!config.sendJoinMessage || config.joinMessage.isEmpty())
-            return;
-        plugin.getLogger().debug(String.format("Player %s(%d) joined the game, send join message.",
-                event.getPlayer().getNickname(), event.getPlayer().getUid()));
-        event.getPlayer().dropMessage(config.joinMessage);
-    }
-}
+//    public static void onJoin(PlayerJoinEvent event) {
+//        // 检查聊天系统是否被其它插件替换
+//        // 不再检查
+////        if (!(plugin.getServer().getChatSystem() instanceof OpenChatSystem)) {
+////            plugin.getLogger().warn("聊天系统已被其它插件更改，现已重置为 OpenChat !");
+////            plugin.getServer().setChatSystem(new OpenChatSystem(plugin));
+////        }
+//
+//        if (!config.sendJoinMessage || config.joinMessage.isEmpty())
+//            return;
+//        var player = event.getPlayer();
+//        plugin.getLogger().debug(String.format("Player %s(%d) joined the game, send join message.",
+//                player.getNickname(), player.getUid()));
+//        plugin.getServer().getScheduler().scheduleDelayedTask(() -> {
+//            if (player.isOnline()) player.dropMessage(config.joinMessage);
+//        }, 60);
+//    }
+//}
diff --git a/src/main/java/com/github/jie65535/openchat/OpenChatPlugin.java b/src/main/java/com/github/jie65535/openchat/OpenChatPlugin.java
index 1b4012a..d5ffd67 100644
--- a/src/main/java/com/github/jie65535/openchat/OpenChatPlugin.java
+++ b/src/main/java/com/github/jie65535/openchat/OpenChatPlugin.java
@@ -20,9 +20,6 @@ package com.github.jie65535.openchat;
 import com.github.jie65535.openchat.commands.ChatPlayerCommands;
 import com.github.jie65535.openchat.commands.ChatServerCommands;
 import emu.grasscutter.plugin.Plugin;
-import emu.grasscutter.server.event.EventHandler;
-import emu.grasscutter.server.event.HandlerPriority;
-import emu.grasscutter.server.event.player.PlayerJoinEvent;
 import emu.grasscutter.utils.JsonUtils;
 
 import java.io.File;
@@ -104,10 +101,10 @@ public final class OpenChatPlugin extends Plugin {
     @Override
     public void onEnable() {
         // Register event listeners.
-        new EventHandler<>(PlayerJoinEvent.class)
-            .priority(HandlerPriority.NORMAL)
-            .listener(EventListeners::onJoin)
-            .register(this);
+//        new EventHandler<>(PlayerJoinEvent.class)
+//            .priority(HandlerPriority.NORMAL)
+//            .listener(EventListeners::onJoin)
+//            .register(this);
 
         // Register commands.
         getHandle().registerCommand(new ChatServerCommands());
diff --git a/src/main/java/com/github/jie65535/openchat/OpenChatSystem.java b/src/main/java/com/github/jie65535/openchat/OpenChatSystem.java
index 4d11a18..c19a77c 100644
--- a/src/main/java/com/github/jie65535/openchat/OpenChatSystem.java
+++ b/src/main/java/com/github/jie65535/openchat/OpenChatSystem.java
@@ -1,3 +1,20 @@
+/*
+ * gc-openchat
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.openchat;
 
 import emu.grasscutter.GameConstants;
@@ -5,6 +22,8 @@ import emu.grasscutter.game.chat.ChatSystem;
 import emu.grasscutter.game.player.Player;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
+import it.unimi.dsi.fastutil.ints.IntSet;
 import it.unimi.dsi.fastutil.longs.LongArrayFIFOQueue;
 
 public class OpenChatSystem extends ChatSystem {
@@ -15,6 +34,27 @@ public class OpenChatSystem extends ChatSystem {
         plugin.getLogger().debug("OpenChatSystem created.");
     }
 
+    IntSet hasHistory = new IntOpenHashSet();
+
+    @Override
+    public void clearHistoryOnLogout(Player player) {
+        super.clearHistoryOnLogout(player);
+        hasHistory.remove(player.getUid());
+    }
+
+    @Override
+    public void handlePullRecentChatReq(Player player) {
+        super.handlePullRecentChatReq(player);
+        if (!hasHistory.contains(player.getUid())) {
+            hasHistory.add(player.getUid());
+            if (plugin.getConfig().sendJoinMessage && !plugin.getConfig().joinMessage.isEmpty()) {
+                plugin.getLogger().debug(String.format("send join message to %s(%d)",
+                        player.getNickname(), player.getUid()));
+                player.dropMessage(plugin.getConfig().joinMessage);
+            }
+        }
+    }
+
     @Override
     public void sendPrivateMessage(Player player, int targetUid, String message) {
         plugin.getLogger().debug(String.format("onSendPrivateMessage: player=%s(%d) targetUid=%d message=%s",
diff --git a/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java b/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java
index 2a5fa81..ca09524 100644
--- a/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java
+++ b/src/main/java/com/github/jie65535/openchat/commands/ChatPlayerCommands.java
@@ -1,3 +1,20 @@
+/*
+ * gc-openchat
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.openchat.commands;
 
 import com.github.jie65535.openchat.OpenChatPlugin;
diff --git a/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java b/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java
index e522731..2789dd9 100644
--- a/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java
+++ b/src/main/java/com/github/jie65535/openchat/commands/ChatServerCommands.java
@@ -1,3 +1,20 @@
+/*
+ * gc-openchat
+ * Copyright (C) 2022  jie65535
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 package com.github.jie65535.openchat.commands;
 
 import com.github.jie65535.openchat.OpenChatPlugin;