The film tells the story of an interrogation accident. The criminal police officer Cheng Bing (played by Qin Hao) of the Third Brigade was imprisoned. His teammates were implicated and escaped from the police and were demoted. The once elite Third Brigade of the police fell apart. After ten years in prison, Cheng Bing regained his freedom, his faith collapsed, his passion turned into silence, he lost everything, and the suspect in the case, Wang Dayong, was still at large... Wearing a police uniform for one day, justice for a lifetime. The Third Brigade needs to explain, and unwillingness turns into persistence. The sharp blade is unsheathed again. Cheng Bing and the brothers of the Third Brigade regrouped and embarked on the road of chasing the murderer. In the lonely and long journey, they cooperated with the police to chase the murderer for thousands of miles, and also found the coordinates of life and the meaning of life in this ascetic process. Adapted from the author Shenlan Literature's work "Please Tell the Director, the Third Brigade Has Completed Its Mission".