The Hong Kong cop action movie revolves around a pair of brothers. The younger brother Kin Shing is the leader of the drug syndicate, code-named "Black Wolf", while the older brother Kin Chung is a member of the Narcotics Division. At the same time, he was involved in a fight against drug lords and it is this investigation that the elder brother discovered that the younger brother had another identity. The two started a confrontation between good and evil for their respective goals.
