Keung and Fai had been good friends since childhood. They both had keen interest in boxing-matches. Having parted with Keung for more than ten years, Fai had become a police officer. On the contrary, Keung had joined an illegal organization as a professional killer. Keung decided to resign from the organization

Tow truck driver Tin bears an uncanny resemblance to a psychotic, serial killer, taxi driver -- and now the cops are chasing the wrong man. He and his cousin Wawa must catch the killer on their own to prove their innocence.

As part of a sociology experiment, Brigitte Lin tries to get lower-class playboy Alan Tam to fall in love with her. Not only does he fall for her, but he finds it impossible to return to his playboy life.

Cousin Big returns home from the UK in order to find a wife and settle down. He has previously driven out his illegal immigrant friend Ma from the UK and the scores aren't settled. That is all cast aside when not only one, not two but three ghosts are to be dealt with and one is Cousin Big who has fallen in love with one of the ghosts.

Lam, a cop approaching 40 but without much accomplishment, always wants to achieve something memorable before his retirement. He is obliged by his sister to find a decent Chinese girl for his nephew, Baffalo, who is an "American Born Chinese". But Baffalo has an eye for a sweetie, Ellen, who has accidentally witnessed a murder. The incident gets Lam, Baffalo and Ellen being involved in a ruthless underground arms smuggling ring, wich sends the killer to eliminate them.

A special agent is assigned to protect a wealthy business magnate. However, when the businessman is kidnapped in a daring ambush, he teams up with a seasoned detective to crack the case. But soon he discovers the case isn't that simple.