Los Angeles police officer Klein (Josh Hartnett Josh Hartnett) is humiliated in the case, and the criminal is bloodthirsty and likes to dismember the living. Clay survived because he was seriously injured, but left a shadow at the bottom of his heart and was forced to be dismissed. Three years later, a wealthy Chinese businessman entrusts Klein to help find his missing son Shi Tao (Takuya Kimura Kimura). He comes to Hong Kong and is received by his good friend Mencius (Yu Wenle Shawn Yue), who is also a policeman. At the police station, Klein passed Shi Tao. Subsequently, a murder in the wilderness occurred, and Mencius suspected that it was done by a homeless man (acted the role of Li Cansen), and the two rushed to the scene. At the same time, the lover of gang leader Su Dongpo (Li Bingxian Byung-hun Lee) (Chen Nu Yanxi Tran Nu Y ê n-Kh ê) is taken by fanatics, who drives away and comes to the wilderness, but is shot dead. During the investigation, Klein gradually discovered the delicate relationship between Lily, Li Bingxian and Shi Tao. This film is the return of Vietnamese director Chen Hero for 7 years and was selected into the competition unit of the 62nd Cannes Film Festival.