diff --git a/domain/src/main/kotlin/com/backgu/amaker/domain/workspace/WorkspaceSession.kt b/domain/src/main/kotlin/com/backgu/amaker/domain/workspace/WorkspaceSession.kt
index 8124678d..abd0e471 100644
--- a/domain/src/main/kotlin/com/backgu/amaker/domain/workspace/WorkspaceSession.kt
+++ b/domain/src/main/kotlin/com/backgu/amaker/domain/workspace/WorkspaceSession.kt
@@ -9,5 +9,5 @@ data class WorkspaceSession
         @JsonProperty("id") val id: String,
         @JsonProperty("userId") val userId: String,
         @JsonProperty("workspaceId") val workspaceId: Long,
-        @JsonProperty("realtimeId") val realtimeId: Long,
+        @JsonProperty("realtimeId") val realtimeId: String,
     )
diff --git a/infra/src/main/kotlin/com/backgu/amaker/infra/redis/workspace/dto/WorkspaceSessionRedisData.kt b/infra/src/main/kotlin/com/backgu/amaker/infra/redis/workspace/dto/WorkspaceSessionRedisData.kt
index bf822bb3..89d53446 100644
--- a/infra/src/main/kotlin/com/backgu/amaker/infra/redis/workspace/dto/WorkspaceSessionRedisData.kt
+++ b/infra/src/main/kotlin/com/backgu/amaker/infra/redis/workspace/dto/WorkspaceSessionRedisData.kt
@@ -10,7 +10,7 @@ data class WorkspaceSessionRedisData
         @JsonProperty("id") val id: String,
         @JsonProperty("userId") val userId: String,
         @JsonProperty("workspaceId") val workspaceId: Long,
-        @JsonProperty("realtimeId") val realtimeId: Long,
+        @JsonProperty("realtimeId") val realtimeId: String,
     ) {
         companion object {
             fun of(workspaceSession: WorkspaceSession) =
diff --git a/realtime/src/main/kotlin/com/backgu/amaker/realtime/config/RestClientConfig.kt b/realtime/src/main/kotlin/com/backgu/amaker/realtime/config/RestClientConfig.kt
deleted file mode 100644
index ce7133c3..00000000
--- a/realtime/src/main/kotlin/com/backgu/amaker/realtime/config/RestClientConfig.kt
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.backgu.amaker.realtime.config
-
-import com.backgu.amaker.common.http.RestClientAspect
-import com.backgu.amaker.realtime.orchestration.config.OrchestrationConfig
-import com.backgu.amaker.realtime.orchestration.infra.OrchestrationClient
-import org.springframework.context.annotation.Bean
-import org.springframework.context.annotation.Configuration
-import org.springframework.web.client.RestClient
-import org.springframework.web.client.support.RestClientAdapter
-import org.springframework.web.service.invoker.HttpServiceProxyFactory
-
-@Configuration
-class RestClientConfig {
-    @Bean
-    fun restClientAspect() = RestClientAspect()
-
-    @Bean
-    fun orchestrationClient(orchestrationConfig: OrchestrationConfig): OrchestrationClient {
-        val restClient = RestClient.builder().baseUrl(orchestrationConfig.baseUrl).build()
-        val adapter = RestClientAdapter.create(restClient)
-        val factory = HttpServiceProxyFactory.builderFor(adapter).build()
-
-        return factory.createClient(OrchestrationClient::class.java)
-    }
-}
diff --git a/realtime/src/main/kotlin/com/backgu/amaker/realtime/workspace/session/WorkspaceWebSocketSession.kt b/realtime/src/main/kotlin/com/backgu/amaker/realtime/workspace/session/WorkspaceWebSocketSession.kt
index 7e471c18..986823e5 100644
--- a/realtime/src/main/kotlin/com/backgu/amaker/realtime/workspace/session/WorkspaceWebSocketSession.kt
+++ b/realtime/src/main/kotlin/com/backgu/amaker/realtime/workspace/session/WorkspaceWebSocketSession.kt
@@ -6,7 +6,7 @@ class WorkspaceWebSocketSession<T>(
     val id: String,
     val userId: String,
     val workspaceId: Long,
-    val realTimeId: Long,
+    val realTimeId: String,
     val session: T,
 ) {
     fun toDomain() = WorkspaceSession(id, userId, workspaceId, realTimeId)
diff --git a/realtime/src/main/kotlin/com/backgu/amaker/realtime/ws/handler/WebSocketSessionHandler.kt b/realtime/src/main/kotlin/com/backgu/amaker/realtime/ws/handler/WebSocketSessionHandler.kt
index 723711fc..d457cb24 100644
--- a/realtime/src/main/kotlin/com/backgu/amaker/realtime/ws/handler/WebSocketSessionHandler.kt
+++ b/realtime/src/main/kotlin/com/backgu/amaker/realtime/ws/handler/WebSocketSessionHandler.kt
@@ -1,6 +1,6 @@
 package com.backgu.amaker.realtime.ws.handler
 
-import com.backgu.amaker.realtime.orchestration.ServerRegister
+import com.backgu.amaker.realtime.server.config.ServerConfig
 import com.backgu.amaker.realtime.utils.WebSocketSessionUtils
 import com.backgu.amaker.realtime.workspace.service.WorkspaceSessionFacadeService
 import com.backgu.amaker.realtime.workspace.session.WorkspaceWebSocketSession
@@ -14,6 +14,7 @@ import org.springframework.web.socket.handler.TextWebSocketHandler
 @Component
 class WebSocketSessionHandler(
     private val workspaceSessionFacadeService: WorkspaceSessionFacadeService,
+    private val serverConfig: ServerConfig,
 ) : TextWebSocketHandler() {
     override fun afterConnectionEstablished(session: WebSocketSession) {
         val userId: String = WebSocketSessionUtils.extractAttribute<String>(session, USER_ID)
@@ -21,7 +22,7 @@ class WebSocketSessionHandler(
         workspaceSessionFacadeService.enrollUserToWorkspaceSession(
             userId,
             workspaceId,
-            WorkspaceWebSocketSession(session.id, userId, workspaceId, ServerRegister.serverId, session),
+            WorkspaceWebSocketSession(session.id, userId, workspaceId, serverConfig.id, session),
         )
     }
 
@@ -35,7 +36,7 @@ class WebSocketSessionHandler(
         workspaceSessionFacadeService.dropOutWorkspaceSession(
             userId,
             workspaceId,
-            WorkspaceWebSocketSession(session.id, userId, workspaceId, ServerRegister.serverId, session),
+            WorkspaceWebSocketSession(session.id, userId, workspaceId, serverConfig.id, session),
         )
     }
 }
diff --git a/realtime/src/test/kotlin/com/backgu/amaker/realtime/workspace/repository/WorkspaceSessionRepositoryTest.kt b/realtime/src/test/kotlin/com/backgu/amaker/realtime/workspace/repository/WorkspaceSessionRepositoryTest.kt
index 1a38eae1..6206b320 100644
--- a/realtime/src/test/kotlin/com/backgu/amaker/realtime/workspace/repository/WorkspaceSessionRepositoryTest.kt
+++ b/realtime/src/test/kotlin/com/backgu/amaker/realtime/workspace/repository/WorkspaceSessionRepositoryTest.kt
@@ -24,7 +24,7 @@ class WorkspaceSessionRepositoryTest : IntegrationTest() {
     fun addWorkspaceSessionTest() {
         // given
         val workspaceId = 1L
-        val workspaceSession = WorkspaceSession(UUID.randomUUID().toString(), "userId", workspaceId, 1)
+        val workspaceSession = WorkspaceSession(UUID.randomUUID().toString(), "userId", workspaceId, "1")
 
         // when
         workspaceSessionRepository.addWorkspaceSession(workspaceId, workspaceSession)