Tai Fei discovers he has a son, and soon realizes that he is a triad member involved in the Tung Sing gang which deals in narcotics.

The story tells the story of a collusion between Hong Kong police and criminals in 1973, under the instigation of the British, they embezzled huge profits and poisoned the citizens. The Governor of Hong Kong established the Independent Commission Against Corruption (ICAC).

On a dark Mongkok night, May, the cousin of Dai Tin-yee, was gang-raped to death by Med King and his men. The furious Tin-yee, together with his buddies, Ho-Nam, Chicken, Pou-Pan tracked down Med King to revenge May’s death. As Med King was under the wing of Ugly Kwan, a leader of the Hung Hing triad, Kwan gave orders to get rid of Ho-Nam by all means….

Inspector Lee and his team look into the mysterious disappearance of a seedy loan shark but find no real leads. Amazingly, the culprits fall into their laps. Four young men, led by Wong Wing-Man, confess to the killing. They were deep in debt and found the murder of their friend to be the only way out. There is one problem, though: no physical evidence.