diff --git a/src/main/java/icu/samnyan/aqua/sega/general/service/CardService.java b/src/main/java/icu/samnyan/aqua/sega/general/service/CardService.java
deleted file mode 100644
index 5f7a992d..00000000
--- a/src/main/java/icu/samnyan/aqua/sega/general/service/CardService.java
+++ /dev/null
@@ -1,70 +0,0 @@
-package icu.samnyan.aqua.sega.general.service;
-
-import icu.samnyan.aqua.sega.general.dao.CardRepository;
-import icu.samnyan.aqua.sega.general.model.Card;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Service;
-
-import java.time.LocalDateTime;
-import java.util.Optional;
-import java.util.concurrent.ThreadLocalRandom;
-
-/**
- * @author samnyan (privateamusement@protonmail.com)
- */
-@Service
-public class CardService {
-
-    private final CardRepository cardRepository;
-
-    @Autowired
-    public CardService(CardRepository cardRepository) {
-        this.cardRepository = cardRepository;
-    }
-
-    /**
-     * Find a card by External Id
-     * @param extId External Id
-     * @return Optional of a Card
-     */
-    public Optional<Card> getCardByExtId(String extId) {
-        return cardRepository.findByExtId(Long.parseLong(extId));
-    }
-
-    /**
-     * Find a card by External Id
-     *
-     * @param extId External Id
-     * @return Optional of a Card
-     */
-    public Optional<Card> getCardByExtId(Long extId) {
-        return cardRepository.findByExtId(extId);
-    }
-
-    /**
-     * Find a card by it's access code
-     * @param accessCode String represent of a access code
-     * @return Optional of a Card
-     */
-    public Optional<Card> getCardByAccessCode(String accessCode) {
-        return cardRepository.findByLuid(accessCode);
-    }
-
-    /**
-     * Register a new card with access code
-     * @param accessCode String represent of a access code
-     * @return a new registered Card
-     */
-    public Card registerByAccessCode(String accessCode) {
-        Card card = new Card();
-        card.setLuid(accessCode);
-        long extId = ThreadLocalRandom.current().nextLong(99999999);
-        while (cardRepository.findByExtId(extId).isPresent()) {
-            extId = ThreadLocalRandom.current().nextLong(99999999);
-        }
-        card.setExtId(extId);
-        card.setRegisterTime(LocalDateTime.now());
-        card.setAccessTime(LocalDateTime.now());
-        return cardRepository.save(card);
-    }
-}
diff --git a/src/main/java/icu/samnyan/aqua/sega/general/service/CardService.kt b/src/main/java/icu/samnyan/aqua/sega/general/service/CardService.kt
new file mode 100644
index 00000000..d7045fa5
--- /dev/null
+++ b/src/main/java/icu/samnyan/aqua/sega/general/service/CardService.kt
@@ -0,0 +1,54 @@
+package icu.samnyan.aqua.sega.general.service
+
+import icu.samnyan.aqua.sega.general.dao.CardRepository
+import icu.samnyan.aqua.sega.general.model.Card
+import org.springframework.stereotype.Service
+import java.time.LocalDateTime
+import java.util.*
+import java.util.concurrent.ThreadLocalRandom
+
+/**
+ * @author samnyan (privateamusement@protonmail.com)
+ */
+@Service
+class CardService(val cardRepo: CardRepository) {
+    /**
+     * Find a card by External Id
+     * @param extId External Id
+     * @return Optional of a Card
+     */
+    fun getCardByExtId(extId: String): Optional<Card> = cardRepo.findByExtId(extId.toLong())
+
+    /**
+     * Find a card by External Id
+     *
+     * @param extId External Id
+     * @return Optional of a Card
+     */
+    fun getCardByExtId(extId: Long?): Optional<Card> = cardRepo.findByExtId(extId)
+
+    /**
+     * Find a card by it's access code
+     * @param accessCode String represent of a access code
+     * @return Optional of a Card
+     */
+    fun getCardByAccessCode(accessCode: String?): Optional<Card> = cardRepo.findByLuid(accessCode)
+
+    /**
+     * Register a new card with access code
+     * @param accessCode String represent of a access code
+     * @return a new registered Card
+     */
+    fun registerByAccessCode(accessCode: String?): Card {
+        val card = Card()
+        card.luid = accessCode
+        var extId = ThreadLocalRandom.current().nextLong(99999999)
+        while (cardRepo.findByExtId(extId).isPresent) {
+            extId = ThreadLocalRandom.current().nextLong(99999999)
+        }
+        card.extId = extId
+        card.registerTime = LocalDateTime.now()
+        card.accessTime = LocalDateTime.now()
+        return cardRepo.save(card)
+    }
+}
diff --git a/src/main/java/icu/samnyan/aqua/sega/maimai2/controller/Maimai2ServletController.java b/src/main/java/icu/samnyan/aqua/sega/maimai2/controller/Maimai2ServletController.java
index 44e668d0..130ad198 100644
--- a/src/main/java/icu/samnyan/aqua/sega/maimai2/controller/Maimai2ServletController.java
+++ b/src/main/java/icu/samnyan/aqua/sega/maimai2/controller/Maimai2ServletController.java
@@ -3,6 +3,7 @@ package icu.samnyan.aqua.sega.maimai2.controller;
 import com.fasterxml.jackson.core.JsonProcessingException;
 
 import icu.samnyan.aqua.sega.maimai2.handler.impl.*;
+import lombok.AllArgsConstructor;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.Map;
@@ -10,6 +11,7 @@ import java.util.Map;
 /**
  * @author samnyan (privateamusement@protonmail.com)
  */
+@AllArgsConstructor
 @RestController
 @RequestMapping({ "/Maimai2Servlet/Maimai2Servlet", "/Maimai2Servlet" })
 public class Maimai2ServletController {
@@ -57,93 +59,6 @@ public class Maimai2ServletController {
     private final GetUserRivalDataHandler getUserRivalDataHandler;
     private final GetUserRivalMusicHandler getUserRivalMusicHandler;
 
-    public Maimai2ServletController(
-            GetGameSettingHandler getGameSettingHandler,
-            GetGameEventHandler getGameEventHandler,
-            GetGameRankingHandler getGameRankingHandler,
-            GetGameTournamentInfoHandler getGameTournamentInfoHandler,
-            GetTransferFriendHandler getTransferFriendHandler,
-            GetUserActivityHandler getUserActivityHandler,
-            UserLoginHandler userLoginHandler,
-            UserLogoutHandler userLogoutHandler,
-            GetUserDataHandler getUserDataHandler,
-            UpsertUserAllHandler upsertUserAllHandler,
-            GetUserPreviewHandler getUserPreviewHandler,
-            GetUserCharacterHandler getUserCharacterHandler,
-            GetUserOptionHandler getUserOptionHandler,
-            GetUserItemHandler getUserItemHandler,
-            GetUserExtendHandler getUserExtendHandler,
-            GetUserGhostHandler getUserGhostHandler,
-            GetUserLoginBonusHandler getUserLoginBonusHandler,
-            GetUserMapHandler getUserMapHandler,
-            GetUserFavoriteHandler getUserFavoriteHandler,
-            GetUserCardHandler getUserCardHandler,
-            GetUserMusicHandler getUserMusicHandler,
-            GetUserRatingHandler getUserRatingHandler,
-            GetUserRegionHandler getUserRegionHandler,
-            GetGameChargeHandler getGameChargeHandler,
-            GetUserChargeHandler getUserChargeHandler,
-            GetUserCourseHandler getUserCourseHandler,
-            UploadUserPhotoHandler uploadUserPhotoHandler,
-            UploadUserPlaylogHandler uploadUserPlaylogHandler,
-            UploadUserPortraitHandler uploadUserPortraitHandler,
-            GetGameNgMusicIdHandler getGameNgMusicIdHandler,
-            GetUserPortraitHandler getUserPortraitHandler,
-            GetUserFriendSeasonRankingHandler getUserFriendSeasonRankingHandler,
-            CMGetUserPreviewHandler cmGetUserPreviewHandler,
-            CMGetSellingCardHandler cmGetSellingCardHandler,
-            GetUserCardPrintErrorHandler getUserCardPrintErrorHandler,
-            CMGetUserCharacterHandler cmGetUserCharacterHandler,
-            UpsertUserPrintHandler upsertUserPrintHandler,
-            GetUserRecommendRateMusicHandler getUserRecommendRateMusicHandler,
-            GetUserRecommendSelectMusicHandler getUserRecommendSelectMusicHandler,
-            GetUserFavoriteItemHandler getUserFavoriteItemHandler,
-            GetUserRivalDataHandler getUserRivalDataHandler,
-            GetUserRivalMusicHandler getUserRivalMusicHandler) {
-        this.getGameSettingHandler = getGameSettingHandler;
-        this.getGameEventHandler = getGameEventHandler;
-        this.getGameRankingHandler = getGameRankingHandler;
-        this.getGameTournamentInfoHandler = getGameTournamentInfoHandler;
-        this.getTransferFriendHandler = getTransferFriendHandler;
-        this.getUserActivityHandler = getUserActivityHandler;
-        this.userLoginHandler = userLoginHandler;
-        this.userLogoutHandler = userLogoutHandler;
-        this.getUserDataHandler = getUserDataHandler;
-        this.upsertUserAllHandler = upsertUserAllHandler;
-        this.getUserPreviewHandler = getUserPreviewHandler;
-        this.getUserCharacterHandler = getUserCharacterHandler;
-        this.getUserOptionHandler = getUserOptionHandler;
-        this.getUserItemHandler = getUserItemHandler;
-        this.getUserExtendHandler = getUserExtendHandler;
-        this.getUserGhostHandler = getUserGhostHandler;
-        this.getUserLoginBonusHandler = getUserLoginBonusHandler;
-        this.getUserMapHandler = getUserMapHandler;
-        this.getUserFavoriteHandler = getUserFavoriteHandler;
-        this.getUserCardHandler = getUserCardHandler;
-        this.getUserMusicHandler = getUserMusicHandler;
-        this.getUserRatingHandler = getUserRatingHandler;
-        this.getUserRegionHandler = getUserRegionHandler;
-        this.getGameChargeHandler = getGameChargeHandler;
-        this.getUserChargeHandler = getUserChargeHandler;
-        this.getUserCourseHandler = getUserCourseHandler;
-        this.uploadUserPhotoHandler = uploadUserPhotoHandler;
-        this.uploadUserPlaylogHandler = uploadUserPlaylogHandler;
-        this.getGameNgMusicIdHandler = getGameNgMusicIdHandler;
-        this.getUserFriendSeasonRankingHandler = getUserFriendSeasonRankingHandler;
-        this.getUserPortraitHandler = getUserPortraitHandler;
-        this.uploadUserPortraitHandler = uploadUserPortraitHandler;
-        this.cmGetUserPreviewHandler = cmGetUserPreviewHandler;
-        this.cmGetSellingCardHandler = cmGetSellingCardHandler;
-        this.getUserCardPrintErrorHandler = getUserCardPrintErrorHandler;
-        this.cmGetUserCharacterHandler = cmGetUserCharacterHandler;
-        this.upsertUserPrintHandler = upsertUserPrintHandler;
-        this.getUserRecommendRateMusicHandler = getUserRecommendRateMusicHandler;
-        this.getUserRecommendSelectMusicHandler = getUserRecommendSelectMusicHandler;
-        this.getUserFavoriteItemHandler = getUserFavoriteItemHandler;
-        this.getUserRivalDataHandler = getUserRivalDataHandler;
-        this.getUserRivalMusicHandler = getUserRivalMusicHandler;
-    }
-
     // Mandatory for boot
     @PostMapping("GetGameEventApi")
     public String getGameEvent(@ModelAttribute Map<String, Object> request) throws JsonProcessingException {