diff --git a/src/command/commands.ts b/src/command/commands.ts
index 0065084..c0c8307 100644
--- a/src/command/commands.ts
+++ b/src/command/commands.ts
@@ -6,7 +6,6 @@ import {
 
 import add_nick_super from "./commands/add_nick_super.js";
 import add_nick from "./commands/add_nick.js";
-import del_members_who_left_super from "./commands/del_members_who_left_super.js";
 import del_nick_super from "./commands/del_nick_super.js";
 import del_user_super from "./commands/del_user_super.js";
 import get_blacklist from "./commands/get_blacklist.js";
@@ -20,7 +19,6 @@ import search from "./commands/search.js";
 const commands: TCommand[] = [
   add_nick_super,
   add_nick,
-  del_members_who_left_super,
   del_nick_super,
   del_user_super,
   get_blacklist,
diff --git a/src/command/commands/del_members_who_left_super.ts b/src/command/commands/del_members_who_left_super.ts
deleted file mode 100644
index d0144c6..0000000
--- a/src/command/commands/del_members_who_left_super.ts
+++ /dev/null
@@ -1,95 +0,0 @@
-import {
-  SlashCommandBuilder,
-  PermissionFlagsBits,
-  ChatInputCommandInteraction,
-  EmbedBuilder,
-} from "discord.js";
-
-import firebase from "../../wrapper/firebase.js";
-import { TUser, embed_to_channel } from "../../functions.js";
-
-export default {
-  data: new SlashCommandBuilder()
-    .setName("del_members_who_left_super")
-    .setDescription(
-      "물갈이(서버에 부하가 있으므로, 과도한 사용을 지양해주세요!)"
-    )
-    .setDefaultMemberPermissions(PermissionFlagsBits.Administrator)
-    .setDMPermission(false),
-  async execute(interaction: ChatInputCommandInteraction) {
-    const members_collection = firebase.collection("members");
-    const members = await members_collection.get();
-    for (const doc of members.docs) {
-      const data = doc.data() as TUser;
-      try {
-        await interaction.guild.members.fetch(data.discord_id);
-      } catch {
-        doc.ref.delete();
-
-        const embed = new EmbedBuilder()
-          .setTitle("물갈이됨")
-          .setDescription("deleted")
-          .setColor(0x0099ff)
-          .setFields([
-            {
-              name: "Command Sender",
-              value: `${interaction.user.tag}(${interaction.user.id})`,
-            },
-            { name: " ", value: " " },
-            { name: "Discord Id", value: data.discord_id },
-            { name: "Minecraft Uuid", value: data.minecraft_uuid },
-          ])
-          .setTimestamp(interaction.createdAt);
-        await embed_to_channel(
-          interaction.client,
-          process.env.LOG_CHANNEL_ID,
-          embed
-        );
-      }
-    }
-
-    // const should_remove = await members
-    //   .where("discord_id", "==", discord_id)
-    //   .get();
-
-    // if (!should_remove.empty) {
-    //   should_remove.forEach((item) => {
-    //     item.ref.delete();
-    //   });
-
-    //   let discord_tag;
-    //   try {
-    //     const discord_user = await interaction.client.users.fetch(discord_id);
-    //     discord_tag = discord_user.tag;
-    //   } catch {
-    //     discord_tag = "Deleted User#0000";
-    //   }
-
-    //   await interaction.editReply({
-    //     content: `삭제 완료:${discord_tag}의 계정을 모두 제거했습니다.`,
-    //   });
-    //   const embed = new EmbedBuilder()
-    //     .setTitle("User deleted")
-    //     .setColor(0x0099ff)
-    //     .setFields([
-    //       {
-    //         name: "Command sender",
-    //         value: `${interaction.user.tag}(${interaction.user.id})`,
-    //       },
-    //       { name: " ", value: " " },
-    //       { name: "Target Discord Id", value: discord_id },
-    //     ])
-    //     .setTimestamp(interaction.createdAt);
-    //   await embed_to_channel(
-    //     interaction.client,
-    //     process.env.LOG_CHANNEL_ID,
-    //     embed
-    //   );
-    //   return;
-    // } else {
-    //   await interaction.editReply({
-    //     content: `\`에러\`: 해당 유저를 찾을 수 없습니다.`,
-    //   });
-    // }
-  },
-};
diff --git a/src/functions.ts b/src/functions.ts
index 61e4ebd..72db536 100644
--- a/src/functions.ts
+++ b/src/functions.ts
@@ -1,7 +1,13 @@
-import { ChatInputCommandInteraction, Client, EmbedBuilder } from "discord.js";
+import {
+  ChatInputCommandInteraction,
+  Client,
+  EmbedBuilder,
+  Guild,
+} from "discord.js";
 import { Firestore } from "firebase-admin/firestore";
 
 import { MojangAPI } from "./wrapper/mojang-api.js";
+import firebase from "./wrapper/firebase.js";
 
 export type TUser = {
   discord_id: string; // id
@@ -120,3 +126,29 @@ export async function embed_to_channel(
   if (!channel.isTextBased()) return;
   channel.send({ embeds: [embed] });
 }
+
+export async function delete_members_who_left(
+  client: Client<true>,
+  guild: Guild
+) {
+  const members_collection = firebase.collection("members");
+  const members = await members_collection.get();
+  for (const doc of members.docs) {
+    const data = doc.data() as TUser;
+    try {
+      await guild.members.fetch(data.discord_id);
+    } catch {
+      doc.ref.delete();
+
+      const embed = new EmbedBuilder()
+        .setTitle("물갈이")
+        .setColor(0x0099ff)
+        .setFields([
+          { name: "Discord Id", value: data.discord_id },
+          { name: "Minecraft Uuid", value: data.minecraft_uuid },
+        ])
+        .setTimestamp(new Date());
+      await embed_to_channel(client, process.env.LOG_CHANNEL_ID, embed);
+    }
+  }
+}
diff --git a/src/main.ts b/src/main.ts
index 9d05380..e6d1867 100755
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,9 +1,16 @@
-import { Client, Events, GatewayIntentBits } from "discord.js";
+import { Client, EmbedBuilder, Events, GatewayIntentBits } from "discord.js";
 import { config } from "dotenv";
 config();
 
 import { getCommands } from "./command/commands.js";
 import mojangAPI from "./wrapper/mojang-api.js";
+import {
+  TUser,
+  delete_members_who_left,
+  embed_to_channel,
+} from "./functions.js";
+import firebase from "./wrapper/firebase.js";
+
 await mojangAPI.load_cache_from_firestore();
 
 const client = new Client({ intents: [GatewayIntentBits.Guilds] });
@@ -11,9 +18,14 @@ const client = new Client({ intents: [GatewayIntentBits.Guilds] });
 const commandCollection = getCommands();
 export let onTime: Date;
 
-client.once(Events.ClientReady, (event) => {
+client.once(Events.ClientReady, async (event) => {
   console.log(`[DISCORD] Ready: discord client as ${event.user.tag}`);
   onTime = new Date();
+
+  delete_members_who_left(
+    client,
+    await client.guilds.fetch(process.env.DISCORD_TARGET_GUILD_ID)
+  );
 });
 
 client.on(Events.InteractionCreate, async (interaction) => {
@@ -43,4 +55,24 @@ client.on(Events.InteractionCreate, async (interaction) => {
   }
 });
 
+client.on(Events.GuildMemberRemove, async (interaction) => {
+  const exited_user = await firebase
+    .collection("members")
+    .where("discord_id", "==", interaction.user.id)
+    .get();
+  for (const doc of exited_user.docs) {
+    const data = doc.data() as TUser;
+    doc.ref.delete();
+    const embed = new EmbedBuilder()
+      .setTitle("물갈이")
+      .setColor(0x0099ff)
+      .setFields([
+        { name: "Discord Id", value: data.discord_id },
+        { name: "Minecraft Uuid", value: data.minecraft_uuid },
+      ])
+      .setTimestamp(new Date());
+    await embed_to_channel(client, process.env.LOG_CHANNEL_ID, embed);
+  }
+});
+
 await client.login(process.env.DISCORD_TOKEN);