Hung is a street-wise smart aleck and Mak is his dumb sidekick. They are partners, mostly in unlawful jobs. One night, the two are spotted by Zaza in the middle of a heist. Consequently, they go to jail. Hung hates Zaza for this. In prison they are befriended by old timer Hui. The three run afoul of boss Orca and try to avoid Orca by insulting chief warden Ko. They are brought before correction officer who is none other than Zaza. Hung hates Zaza more.

Leslie Cheungas Leslie Cheung
Natalis Chan Pak-Cheungas Hung Ka Bo
Sylvia Changas Cheung Ka Ka
David Wuas Hui Koon Yan
Charlie Cho Cha-Leeas Prison Officer Lau
Fung Ging-Manas Killer Whale
Lee Hoi-Sangas Prison Guard in Van
Tam Chuen-Hingas Officer Tam