The top student in the police academy in the past is now a prisoner. One shot saved four children, but ruined his own life. After being released from prison, Yang Xiao faced the desperate situation of being estranged from his family, pursued by his enemies, and unable to return to the police force. He chose a path of no return - gathering his former teammates and following the rules of the rivers and lakes to fight against fate in the black land of Northeast China. This is not the return of a hero, but how a person who has been abandoned by the system holds on to his last bottom line on the edge of black and white.
