diff --git a/src/command/commands.ts b/src/command/commands.ts
index 57899fe..752a151 100644
--- a/src/command/commands.ts
+++ b/src/command/commands.ts
@@ -1,6 +1,7 @@
 import { TCommand } from "../functions.js";
 
 import add_nick_super from "./commands/add_nick_super.js";
+import add_nick from "./commands/add_nick.js";
 
-const commands: TCommand[] = [add_nick_super];
+const commands: TCommand[] = [add_nick_super, add_nick];
 export default commands;
diff --git a/src/command/commands/add_nick.js b/src/command/commands/add_nick.js
deleted file mode 100755
index 194afd9..0000000
--- a/src/command/commands/add_nick.js
+++ /dev/null
@@ -1,90 +0,0 @@
-const { SlashCommandBuilder } = require("discord.js");
-const mojangAPI = new (require("mojang-api-js"))();
-
-const firebase_admin = require("firebase-admin");
-const { getDatabase } = require("firebase-admin/database");
-const serviceAccount = require("../firebase/conf.json");
-if (!firebase_admin.apps.length) {
-  firebase_admin.initializeApp({
-    credential: firebase_admin.credential.cert(serviceAccount),
-    databaseURL: process.env.FIREBASE_URL,
-    databaseAuthVariableOverride: {
-      uid: process.env.FIREBASE_UID,
-    },
-  });
-}
-const firebase = getDatabase().ref("/");
-
-module.exports = {
-  data: new SlashCommandBuilder()
-    .setName("add_nick")
-    .setDescription("Add your nickname on the list and share it to 2k2rs")
-    .addStringOption((option) => option.setName("minecraft_id").setDescription("id of the minecraft account").setRequired(true))
-    .setDMPermission(false),
-  async execute(interaction) {
-    await interaction.deferReply({ ephemeral: true });
-    let minecraft;
-    try {
-      minecraft = await mojangAPI.nameToUuid(interaction.options.getString("minecraft_id"));
-    } catch (err) {
-      if (err.message == "204 status code") {
-        await interaction.editReply({
-          content: "`에러`: 닉네임 검색을 실패했어요(닉네임을 정확하게 입력했나요?)",
-          ephemeral: true,
-        });
-        return;
-      }
-    }
-
-    let data = (await firebase.get()).val();
-
-    for (let discord_search_point in data["blacklist"]) {
-      if (data["blacklist"][discord_search_point].discord == interaction.user.id) {
-        await interaction.editReply({
-          content: "`에러`:해당 디스코드 아이디는 블랙리스팅 되었습니다! ~~2k2r에서 꺼져주세요!~~",
-          ephemeral: true,
-        });
-        return;
-      }
-      for (let minecraft_search_point in data["blacklist"][discord_search_point].minecraft) {
-        if (data["blacklist"][discord_search_point].minecraft[minecraft_search_point] == minecraft.id) {
-          await interaction.editReply({
-            content: "`에러`:해당 마인크래프트 아이디는 블랙리스팅 되었습니다!",
-            ephemeral: true,
-          });
-          return;
-        }
-      }
-    }
-
-    for (let discord_search_point in data["members"]) {
-      for (let minecraft_search_point in data["members"][discord_search_point].minecraft) {
-        if (data["members"][discord_search_point].minecraft[minecraft_search_point] == minecraft.id) {
-          await interaction.editReply({
-            content: "`에러`:해당 마인크래프트 아이디는 이미 등록되었습니다!",
-            ephemeral: true,
-          });
-          return;
-        }
-      } //신규 마크일 경우
-      if (data["members"][discord_search_point].discord == interaction.user.id) {
-        await interaction.editReply({
-          content: `${minecraft.name}(${minecraft.id})이 성공적으로 부계정으로 등록되었습니다!`,
-          ephemeral: true,
-        });
-        data["members"][discord_search_point].minecraft.push(minecraft.id);
-        await firebase.set(data);
-        return;
-      }
-    } //신규 디코일 경우
-    await interaction.editReply({
-      content: `${minecraft.name}(${minecraft.id})님 2k2r에 오신것을 환영합니다!`,
-      ephemeral: true,
-    });
-    data["members"].push({
-      discord: interaction.user.id,
-      minecraft: [minecraft.id],
-    });
-    await firebase.set(data);
-  },
-};
diff --git a/src/command/commands/add_nick.ts b/src/command/commands/add_nick.ts
new file mode 100755
index 0000000..5bea1f1
--- /dev/null
+++ b/src/command/commands/add_nick.ts
@@ -0,0 +1,66 @@
+import { SlashCommandBuilder, ChatInputCommandInteraction } from "discord.js";
+import mojangAPI from "../../wrapper/mojang-api.js";
+import firebase from "../../wrapper/firebase.js";
+
+export default {
+  data: new SlashCommandBuilder()
+    .setName("add_nick")
+    .setDescription("Add your nickname on the list and share it to 2k2rs")
+    .addStringOption((option) =>
+      option
+        .setName("minecraft_id")
+        .setDescription("id of the minecraft account")
+        .setRequired(true)
+    )
+    .setDMPermission(false),
+  async execute(interaction: ChatInputCommandInteraction) {
+    const discord_id = interaction.user.id;
+    const mcid = interaction.options.getString("minecraft_id") as string;
+    let mcuuid: string;
+    try {
+      mcuuid = await mojangAPI.getUUIDFromId(mcid);
+    } catch {
+      await interaction.editReply({
+        content:
+          "`에러`: 마인크래프트 닉네임 검색을 실패했습니다. 마인크래프트 닉네임을 정확하게 입력했나요?",
+      });
+      return;
+    }
+
+    const members = firebase.collection("members");
+    const blacklist = firebase.collection("blacklist");
+
+    if (!(await blacklist.where("discord_id", "==", discord_id).get()).empty) {
+      interaction.editReply({
+        content: "`에러`: 해당 디스코드 아이디는 블랙리스트 되었습니다.",
+      });
+      return;
+    }
+    if (!(await blacklist.where("minecraft_uuid", "==", mcuuid).get()).empty) {
+      interaction.editReply({
+        content: "`에러`: 해당 마인크래프트 계정은 블랙리스트 되었습니다.",
+      });
+      return;
+    }
+    if (!(await members.where("minecraft_uuid", "==", mcuuid).get()).empty) {
+      interaction.editReply({
+        content: "`에러`: 해당 마인크래프트 아이디는 이미 등록되었습니다.",
+      });
+      return;
+    }
+
+    if (!(await members.where("discord_id", "==", discord_id).get()).empty) {
+      await interaction.editReply({
+        content: `${mcid}(${mcuuid})님 2k2r에 오신것을 환영합니다!`,
+      });
+    } else {
+      await interaction.editReply({
+        content: `${mcid}(${mcuuid})이 성공적으로 부계정으로 등록되었습니다!`,
+      });
+    }
+    await members.add({
+      discord_id,
+      minecraft_uuid: mcuuid,
+    });
+  },
+};
diff --git a/src/command/commands/add_nick_super.ts b/src/command/commands/add_nick_super.ts
index 475d4e2..c5ad187 100755
--- a/src/command/commands/add_nick_super.ts
+++ b/src/command/commands/add_nick_super.ts
@@ -2,17 +2,10 @@ import {
   SlashCommandBuilder,
   PermissionFlagsBits,
   ChatInputCommandInteraction,
-  User,
 } from "discord.js";
 
 import mojangAPI from "../../wrapper/mojang-api.js";
 import firebase from "../../wrapper/firebase.js";
-import {
-  check_user_type_by_discord_id,
-  check_user_type_by_minecraft_uuid,
-  EUserType,
-  TData,
-} from "../../functions.js";
 
 export default {
   data: new SlashCommandBuilder()
@@ -33,17 +26,7 @@ export default {
     .setDefaultMemberPermissions(PermissionFlagsBits.Administrator)
     .setDMPermission(false),
   async execute(interaction: ChatInputCommandInteraction) {
-    let data = (await firebase.get()).val() as TData;
-
     const discord_id = interaction.options.getUser("discord")?.id as string;
-    const dcusertype = check_user_type_by_discord_id(data, discord_id);
-    if (dcusertype == EUserType.Blacklisted) {
-      interaction.editReply({
-        content: "`에러`: 해당 디스코드 아이디는 블랙리스트 되었습니다.",
-      });
-      return;
-    }
-
     const mcid = interaction.options.getString("minecraft_id") as string;
     let mcuuid: string;
     try {
@@ -55,35 +38,41 @@ export default {
       });
       return;
     }
-    const mcusertype = check_user_type_by_minecraft_uuid(data, mcuuid);
 
-    if (mcusertype == EUserType.Blacklisted) {
+    const members = firebase.collection("members");
+    const blacklist = firebase.collection("blacklist");
+
+    if (!(await blacklist.where("discord_id", "==", discord_id).get()).empty) {
       interaction.editReply({
-        content: "`에러`: 해당 마인크래프트 아이디는 블랙리스트 되었습니다.",
+        content: "`에러`: 해당 디스코드 아이디는 블랙리스트 되었습니다.",
       });
       return;
-    } else if (mcusertype == EUserType.Member) {
+    }
+    if (!(await blacklist.where("minecraft_uuid", "==", mcuuid).get()).empty) {
+      interaction.editReply({
+        content: "`에러`: 해당 마인크래프트 계정은 블랙리스트 되었습니다.",
+      });
+      return;
+    }
+    if (!(await members.where("minecraft_uuid", "==", mcuuid).get()).empty) {
       interaction.editReply({
         content: "`에러`: 해당 마인크래프트 아이디는 이미 등록되었습니다.",
       });
       return;
     }
 
-    if (dcusertype == EUserType.Unregistered) {
+    if (!(await members.where("discord_id", "==", discord_id).get()).empty) {
       await interaction.editReply({
         content: `${mcid}(${mcuuid})님 2k2r에 오신것을 환영합니다!`,
       });
-      data["members"].push({ discord: discord_id, minecraft: [mcuuid] });
     } else {
-      for (let member of data.members) {
-        if (member.discord == discord_id) {
-          await interaction.editReply({
-            content: `${mcid}(${mcuuid})이 성공적으로 부계정으로 등록되었습니다!`,
-          });
-          member.minecraft.push(mcuuid);
-        }
-      } //신규 디코일 경우
+      await interaction.editReply({
+        content: `${mcid}(${mcuuid})이 성공적으로 부계정으로 등록되었습니다!`,
+      });
     }
-    await firebase.set(data);
+    await members.add({
+      discord_id,
+      minecraft_uuid: mcuuid,
+    });
   },
 };
diff --git a/src/functions.ts b/src/functions.ts
index f78512a..7cd2b51 100644
--- a/src/functions.ts
+++ b/src/functions.ts
@@ -6,66 +6,6 @@ export type TCommand = {
   data: SlashCommandBuilder;
   execute: Function;
 };
-export type TUser = {
-  discord: string; // id
-  minecraft: string[]; //uuid
-};
-export type TData = {
-  blacklist: TUser[];
-  members: TUser[];
-};
-export enum EUserType {
-  Unregistered,
-  Blacklisted,
-  Member,
-}
-export function check_user_type_by_discord_id(
-  data: TData,
-  discord_id: string
-): EUserType {
-  for (let discord_search_point in data["blacklist"]) {
-    if (data.blacklist[discord_search_point].discord === discord_id) {
-      return EUserType.Blacklisted;
-    }
-  }
-  for (let discord_search_point in data["members"]) {
-    if (data.blacklist[discord_search_point].discord === discord_id) {
-      return EUserType.Member;
-    }
-  }
-  return EUserType.Unregistered;
-}
-
-export function check_user_type_by_minecraft_uuid(
-  data: TData,
-  minecraft_uuid: string
-): EUserType {
-  for (let discord_search_point in data.blacklist) {
-    for (let minecraft_search_point in data.blacklist[discord_search_point]
-      .minecraft) {
-      if (
-        data.blacklist[discord_search_point].minecraft[
-          minecraft_search_point
-        ] === minecraft_uuid
-      ) {
-        return EUserType.Blacklisted;
-      }
-    }
-  }
-  for (let discord_search_point in data.members) {
-    for (let minecraft_search_point in data.members[discord_search_point]
-      .minecraft) {
-      if (
-        data.members[discord_search_point].minecraft[minecraft_search_point] ===
-        minecraft_uuid
-      ) {
-        return EUserType.Member;
-      }
-    }
-  }
-  return EUserType.Unregistered;
-}
-
 export function getCommands(): Collection<string, TCommand> {
   const commandColection = new Collection<string, TCommand>();
   for (const command of commands) {
@@ -73,3 +13,64 @@ export function getCommands(): Collection<string, TCommand> {
   }
   return commandColection;
 }
+
+export type TUser = {
+  discord: string; // id
+  minecraft: string[]; //uuid
+};
+
+// export type TData = {
+//   blacklist: TUser[];
+//   members: TUser[];
+// };
+// export enum EUserType {
+//   Unregistered,
+//   Blacklisted,
+//   Member,
+// }
+// export function check_user_type_by_discord_id(
+//   data: TData,
+//   discord_id: string
+// ): EUserType {
+//   for (let discord_search_point in data["blacklist"]) {
+//     if (data.blacklist[discord_search_point].discord === discord_id) {
+//       return EUserType.Blacklisted;
+//     }
+//   }
+//   for (let discord_search_point in data["members"]) {
+//     if (data.blacklist[discord_search_point].discord === discord_id) {
+//       return EUserType.Member;
+//     }
+//   }
+//   return EUserType.Unregistered;
+// }
+
+// export function check_user_type_by_minecraft_uuid(
+// data: TData,
+//   minecraft_uuid: string
+// ): EUserType {
+//   for (let discord_search_point in data.blacklist) {
+//     for (let minecraft_search_point in data.blacklist[discord_search_point]
+//       .minecraft) {
+//       if (
+//         data.blacklist[discord_search_point].minecraft[
+//           minecraft_search_point
+//         ] === minecraft_uuid
+//       ) {
+//         return EUserType.Blacklisted;
+//       }
+//     }
+//   }
+//   for (let discord_search_point in data.members) {
+//     for (let minecraft_search_point in data.members[discord_search_point]
+//       .minecraft) {
+//       if (
+//         data.members[discord_search_point].minecraft[minecraft_search_point] ===
+//         minecraft_uuid
+//       ) {
+//         return EUserType.Member;
+//       }
+//     }
+//   }
+//   return EUserType.Unregistered;
+// }
diff --git a/src/wrapper/firebase.ts b/src/wrapper/firebase.ts
index 1e4aeea..9d1b43e 100644
--- a/src/wrapper/firebase.ts
+++ b/src/wrapper/firebase.ts
@@ -1,19 +1,12 @@
-import firebase_admin from "firebase-admin";
-import { getDatabase } from "firebase-admin/database";
+import { initializeApp, cert } from "firebase-admin/app";
+import { getFirestore } from "firebase-admin/firestore";
 import { config } from "dotenv";
 config();
 
-if (!firebase_admin.apps.length) {
-  firebase_admin.initializeApp({
-    credential: firebase_admin.credential.cert(
-      JSON.parse(process.env["firebase_cert"] as string)
-    ),
-    databaseURL: "https://two-k-two-r-name-bot-default-rtdb.firebaseio.com",
-    databaseAuthVariableOverride: {
-      uid: process.env.FIREBASE_UID,
-    },
-  });
-}
-const firebase = getDatabase().ref("/");
+initializeApp({
+  credential: cert(JSON.parse(process.env["firebase_cert"] as string)),
+});
 
-export default firebase;
+const db = getFirestore();
+
+export default db;