Gan Tianlei, Xiong Guoliang and Yang Xiaolei used to be the Three Musketeers of the police academy. However, Gan Tianlei was dismissed after he wounded someone in order to help Yang Xiaolei. After leaving the academy, he was recruited by Caesar Group and started working undercover. During a mission, Gan Tianlei gets caught in an explosion and falls into a coma. Eight years later, Gan Tianlei awakes in the hospital but loses all his memories. Finally, all criminals from two major gangs—Caesar and Tan’s—were arrested by the police....