Four brothers and sisters were killed in the chaos. After some investigation, the three of them found out that Zhang Jing of the police headquarters was having an affair with Tian Shengyang. It turned out that superintendent Zhang was the one who betrayed Tian Shengyang in the Vietnam War. That night, Tian Shengyang disguised himself as a policeman and went to the police headquarters to find Superintendent Zhang. Jin Chen arrived in time. At the same time, when the police headquarters was in chaos, Jin Chen decided to join hands with Tian Shengyang for a life-and-death duel.