diff --git a/common/src/main/kotlin/space/mori/chzzk_bot/common/models/User.kt b/common/src/main/kotlin/space/mori/chzzk_bot/common/models/User.kt
index 281d4c1..dcb8b03 100644
--- a/common/src/main/kotlin/space/mori/chzzk_bot/common/models/User.kt
+++ b/common/src/main/kotlin/space/mori/chzzk_bot/common/models/User.kt
@@ -28,8 +28,8 @@ class User(id: EntityID<Int>) : IntEntity(id) {
     var liveAlertMessage by Users.liveAlertMessage
 
     // 유저가 가진 매니저들
-    val managers by User.via(UserManagers.manager, UserManagers.user)
+    var managers by User.via(UserManagers.user, UserManagers.manager)
 
     // 매니저가 관리하는 유저들
-    val subordinates by User.via(UserManagers.user, UserManagers.manager)
+    var subordinates by User.via(UserManagers.manager, UserManagers.user)
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/space/mori/chzzk_bot/common/models/UserManager.kt b/common/src/main/kotlin/space/mori/chzzk_bot/common/models/UserManager.kt
index b4e98f4..7a35edc 100644
--- a/common/src/main/kotlin/space/mori/chzzk_bot/common/models/UserManager.kt
+++ b/common/src/main/kotlin/space/mori/chzzk_bot/common/models/UserManager.kt
@@ -1,9 +1,9 @@
 package space.mori.chzzk_bot.common.models
 
+import org.jetbrains.exposed.dao.id.IntIdTable
 import org.jetbrains.exposed.sql.ReferenceOption
-import org.jetbrains.exposed.sql.Table
 
-object UserManagers: Table("user_managers") {
+object UserManagers: IntIdTable("user_managers") {
     val user = reference("user_id", Users, ReferenceOption.CASCADE)
     val manager = reference("manager_id", Users, ReferenceOption.CASCADE)
 }
\ No newline at end of file
diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt
index da2daa4..ab7bcc2 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiCommandRoutes.kt
@@ -54,7 +54,7 @@ fun Routing.apiCommandRoutes() {
                 return@put
             }
 
-            if(!user.managers?.any { it.naverId == session?.id }!! ?: true && user.naverId != session?.id) {
+            if(!user.managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
                 return@put
             }
@@ -84,7 +84,7 @@ fun Routing.apiCommandRoutes() {
                 return@post
             }
 
-            if(!user.managers?.any { it.naverId == session?.id }!! ?: true && user.naverId != session?.id) {
+            if(!user.managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
                 return@post
             }
diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt
index c3a8829..ec2ab17 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiRoutes.kt
@@ -116,7 +116,7 @@ fun Routing.apiRoutes() {
                 songConfig.streamerOnly,
                 songConfig.disabled
             ))
-            val subordinates = user.subordinates ?: emptyList()
+            val subordinates = user.subordinates
             returnUsers.addAll(subordinates.map {
                 val subStatus = user.token?.let { it1 -> getStreamInfo(it1) }
                 return@map if (it.token == null || subStatus?.content == null) {
diff --git a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt
index 26fbe86..c39c898 100644
--- a/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt
+++ b/webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/ApiTimerRoutes.kt
@@ -27,7 +27,7 @@ fun Routing.apiTimerRoutes() {
                 return@get
             }
 
-            if(!user.managers?.any { it.naverId == session?.id }!! ?: true && user.naverId != session?.id) {
+            if(!user.managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
                 return@get
             }
@@ -51,7 +51,7 @@ fun Routing.apiTimerRoutes() {
                 return@put
             }
 
-            if(!user.managers?.any { it.naverId == session?.id }!! ?: true && user.naverId != session?.id) {
+            if(!user.managers.any { it.naverId == session?.id } && user.naverId != session?.id) {
                 call.respond(HttpStatusCode.BadRequest, "User does not exist")
                 return@put
             }