diff --git a/src/main/java/org/yj/sejongauth/controller/Sj.java b/src/main/java/org/yj/sejongauth/controller/Sj.java
index 84671da..6d91d2b 100644
--- a/src/main/java/org/yj/sejongauth/controller/Sj.java
+++ b/src/main/java/org/yj/sejongauth/controller/Sj.java
@@ -1,19 +1,23 @@
 package org.yj.sejongauth.controller;
 
 import org.yj.sejongauth.domain.AuthService;
-import org.yj.sejongauth.domain.LoginReq;
-import org.yj.sejongauth.domain.ProfileRes;
+import org.yj.sejongauth.domain.SjProfile;
 import org.yj.sejongauth.domain.ProfileService;
 
 public class Sj {
 
-    private static final AuthService authService = new AuthService();
-    private static final ProfileService PROFILE_SERVICE = new ProfileService();
+    private final AuthService authService;
+    private final ProfileService profileService;
 
-    public static ProfileRes login(LoginReq loginReq) {
-        if (authService.authenticate(loginReq)) {
+    public Sj(AuthService authService, ProfileService profileService){
+        this.authService = authService;
+        this.profileService = profileService;
+    }
+
+    public SjProfile login(String userId, String password) {
+        if (authService.authenticate(userId, password)) {
             String jsessionId = authService.getJsessionId();
-            return PROFILE_SERVICE.fetchUserProfile(jsessionId);
+            return profileService.fetchUserProfile(jsessionId);
         } else {
             throw new RuntimeException("인증에 실패하였습니다.");
         }
diff --git a/src/main/java/org/yj/sejongauth/domain/AuthService.java b/src/main/java/org/yj/sejongauth/domain/AuthService.java
index 2c975b4..66db927 100644
--- a/src/main/java/org/yj/sejongauth/domain/AuthService.java
+++ b/src/main/java/org/yj/sejongauth/domain/AuthService.java
@@ -19,7 +19,8 @@ public class AuthService {
     private final String INVALID_URL = "URL이 유효하지 않습니다.";
     private final String CONTAINS_HTML = "로그인 정보가 올바르지 않습니다.";
 
-    public boolean authenticate(LoginReq loginReq) {
+    public boolean authenticate(String userId, String password) {
+        LoginReq loginReq = new LoginReq(userId, password);
         try {
             fetchJsessionId();
             return attemptLogin(loginReq);
diff --git a/src/main/java/org/yj/sejongauth/domain/ProfileService.java b/src/main/java/org/yj/sejongauth/domain/ProfileService.java
index 67b9c8a..916377d 100644
--- a/src/main/java/org/yj/sejongauth/domain/ProfileService.java
+++ b/src/main/java/org/yj/sejongauth/domain/ProfileService.java
@@ -12,7 +12,7 @@ public class ProfileService {
     private final String PROFILE_URL = "http://classic.sejong.ac.kr/userCertStatus.do?menuInfoId=MAIN_02_05";
     private final String FAIDED_PROFILE = "정보 조회에 실패하였습니다.";
 
-    public ProfileRes fetchUserProfile(String jsessionId) {
+    public SjProfile fetchUserProfile(String jsessionId) {
         try {
             URL url = new URL(PROFILE_URL);
             HttpURLConnection connection = (HttpURLConnection) url.openConnection();
@@ -37,7 +37,7 @@ private String readResponse(HttpURLConnection connection) throws IOException {
         }
     }
 
-    private ProfileRes parseProfileFromHtml(Document document) {
+    private SjProfile parseProfileFromHtml(Document document) {
         String major = document.select("div.contentWrap li dl dd").get(0).text();
         String studentCode = document.select("div.contentWrap li dl dd").get(1).text();
         String name = document.select("div.contentWrap li dl dd").get(2).text();
@@ -46,6 +46,6 @@ private ProfileRes parseProfileFromHtml(Document document) {
         int completedSemesters = Integer.parseInt(document.select("div.contentWrap li dl dd").get(5).text().split(" ")[0]);
         int verifiedSemesters = Integer.parseInt(document.select("div.contentWrap li dl dd").get(6).text().split(" ")[0]);
 
-        return new ProfileRes(major, studentCode, name, gradeLevel, userStatus, completedSemesters, verifiedSemesters);
+        return new SjProfile(major, studentCode, name, gradeLevel, userStatus, completedSemesters, verifiedSemesters);
     }
 }
diff --git a/src/main/java/org/yj/sejongauth/domain/ProfileRes.java b/src/main/java/org/yj/sejongauth/domain/SjProfile.java
similarity index 81%
rename from src/main/java/org/yj/sejongauth/domain/ProfileRes.java
rename to src/main/java/org/yj/sejongauth/domain/SjProfile.java
index ef297bc..fe6d63e 100644
--- a/src/main/java/org/yj/sejongauth/domain/ProfileRes.java
+++ b/src/main/java/org/yj/sejongauth/domain/SjProfile.java
@@ -1,6 +1,6 @@
 package org.yj.sejongauth.domain;
 
-public class ProfileRes {
+public class SjProfile {
     private final String major;
     private final String studentCode;
     private final String name;
@@ -9,9 +9,9 @@ public class ProfileRes {
     private final int completedSemesters;
     private final int verifiedSemesters;
 
-    public ProfileRes(String major, String studentCode, String name,
-                      int gradeLevel, String userStatus,
-                      int completedSemesters, int verifiedSemesters) {
+    public SjProfile(String major, String studentCode, String name,
+                     int gradeLevel, String userStatus,
+                     int completedSemesters, int verifiedSemesters) {
         this.major = major;
         this.studentCode = studentCode;
         this.name = name;
diff --git a/src/test/java/org/yj/sejongauth/domain/ProfileServiceTest.java b/src/test/java/org/yj/sejongauth/domain/ProfileServiceTest.java
index da82637..762c456 100644
--- a/src/test/java/org/yj/sejongauth/domain/ProfileServiceTest.java
+++ b/src/test/java/org/yj/sejongauth/domain/ProfileServiceTest.java
@@ -22,7 +22,7 @@ void testFetchUserProfile_Success() {
         String jsessionId = "valid-session-id";
 
         // When
-        ProfileRes profile = profileService.fetchUserProfile(jsessionId);
+        SjProfile profile = profileService.fetchUserProfile(jsessionId);
 
         // Then
         assertNotNull(profile);