Four years ago, the drug cartel [District B] was rounded up. Of the four founders, only Chen Shulu's father, Chen Jingyou, was left. In that roundup, Chen Shulu lost his best brother, Chen Changle, and witnessed and personally caused Chen Changle's death. After his death, Chen Shulu worked under Chen Jingyou [District B] just to avenge Chen Changle... Four years later, at a banquet, Chen Shulu met a detective who looked exactly like Chen Changle, Chang An...
Intention: Even if we are on opposite sides... You are still my brother