In order to restore the image of the police in the eyes of the public and to create personal achievements, the newly appointed Sampo City Police Chief Lee Seung-woo (Sun Binghao) decided to conduct a simulated bank robbery exercise. Of course, the attitude of the police station towards this training is tacitly understood by everyone, and everyone understands that this is just a show, but the patrolman Zheng Duman (Zheng Zaiyong) who was assigned to play the robber does not think so. Zheng Duman, who usually acts silently and meticulously, studied the robbers' methods after receiving the order and completely entered the role. On the day of the exercise, Zheng Duman's professional performance shocked everyone. The plainclothes police and the commando team were "killed" under Zheng Duman's gun. Li Chengyu, who originally planned to make a big splash in front of the media, failed to do his best, but he could do nothing about Zheng Duman. How will this "robber" exercise end? The script of this film is written by the famous Korean screenwriter Zhang Zhen, whose well-known works include "Welcome to Dongmo Village" and so on.