Kin Shing is the leader of a drug syndicate, code-named "Black Wolf", while his older brother Kin Chung is a member of the Narcotics Division of the Hong Kong Police Force. At the same time, he is involved in a fight against drug lords and it is this investigation that the elder brother discovers that his younger brother had another identity. The two starte a confrontation between good and evil for their respective goals.

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