diff --git a/src/openai-service.ts b/src/openai-service.ts
index 99bd617..1559ffa 100644
--- a/src/openai-service.ts
+++ b/src/openai-service.ts
@@ -8,6 +8,7 @@ import { getOpenAIUrl } from './utils/api-urls';
 import { ERROR_MESSAGES } from './constants/messages';
 import { getServerSession, processServerConsultation } from './agents/server-agent';
 import { getTroubleshootSession, processTroubleshoot } from './agents/troubleshoot-agent';
+import { processDomainConsultation, hasDomainSession } from './agents/domain-agent';
 import { sendMessage } from './telegram';
 
 const logger = createLogger('openai');
@@ -263,6 +264,29 @@ export async function generateOpenAIResponse(
       logger.error('Troubleshoot session check failed, continuing with normal flow', error as Error);
       // Continue with normal flow if session check fails
     }
+
+    // Check if domain consultation session is active
+    try {
+      const hasDomainSess = await hasDomainSession(env.DB, telegramUserId);
+
+      if (hasDomainSess) {
+        logger.info('도메인 세션 감지, 도메인 에이전트로 라우팅', {
+          userId: telegramUserId
+        });
+        const domainResponse = await processDomainConsultation(env.DB, telegramUserId, userMessage, env);
+
+        // PASSTHROUGH: 무관한 메시지는 일반 처리로 전환
+        if (domainResponse !== '__PASSTHROUGH__') {
+          return domainResponse;
+        }
+        // Continue to normal flow below
+      }
+    } catch (error) {
+      logger.error('Domain session check failed, continuing with normal flow', error as Error, {
+        telegramUserId
+      });
+      // Continue with normal flow if session check fails
+    }
   }
 
   if (!env.OPENAI_API_KEY) {