diff --git a/back/src/wos/wos.service.ts b/back/src/wos/wos.service.ts
index 85dffdc..7c6b0cf 100644
--- a/back/src/wos/wos.service.ts
+++ b/back/src/wos/wos.service.ts
@@ -113,9 +113,11 @@ export class WosService {
     fid: string,
     code: string,
   ): Promise<{ success: boolean; message: string; err_code?: number }> {
-    for (let attempt = 1; attempt <= 2; attempt++) {
+    let attempt = 0;
+    while (true) {
+      attempt++;
       if (attempt > 1) {
-        this.logger.warn(`[${fid}] ${code} 캡차 오인식, 30초 대기 후 재시도`);
+        this.logger.warn(`[${fid}] ${code} 캡차 오인식 (${attempt - 1}회), 30초 대기 후 재시도`);
         await new Promise((r) => setTimeout(r, 30000));
       }
 
@@ -138,15 +140,13 @@ export class WosService {
       this.logger.log(`[${fid}] ${code} attempt=${attempt} captcha=${captchaCode} → code=${data.code} err=${data.err_code} msg=${data.msg}`);
 
       if (data.code === 0) return { success: true, message: SUCCESS_MSG };
-      if (data.err_code === 40103 && attempt < 2) continue;
+      if (data.err_code === 40103) continue;
       return {
         success: false,
         message: data.msg || `실패 (${data.err_code})`,
         err_code: data.err_code,
       };
     }
-
-    return { success: false, message: '알 수 없는 오류' };
   }
 
   async redeemAll(fid: string) {