The story takes place in Fengtian, Puppet Manchuria. Puppet policeman Song Wenxuan was forced to get involved in the dispute due to the murder of a Japanese officer. Kwantung Army Major Sato is trying to suppress the police step by step, and the police station is surrounded by crises. He accidentally comes into contact with the anti-Japanese organization Loyalty Regiment, and gets acquainted with female traffic officer Su Wan, insider Lao Jia and other companions. Amidst repeated trials and crises, he makes up his mind to become an undercover agent.
