diff --git a/springboot-webflux-3-mongodb/src/main/java/org/spring/springboot/handler/CityHandler.java b/springboot-webflux-3-mongodb/src/main/java/org/spring/springboot/handler/CityHandler.java
index 096ceb8..f52f7cf 100644
--- a/springboot-webflux-3-mongodb/src/main/java/org/spring/springboot/handler/CityHandler.java
+++ b/springboot-webflux-3-mongodb/src/main/java/org/spring/springboot/handler/CityHandler.java
@@ -37,7 +37,6 @@ public class CityHandler {
     }
 
     public Mono<Long> deleteCity(Long id) {
-        cityRepository.deleteById(id);
-        return Mono.create(cityMonoSink -> cityMonoSink.success(id));
+        return cityRepository.deleteById(id).flatMap(mono -> Mono.create(cityMonoSink -> cityMonoSink.success(id)));
     }
 }