Roy Cheung Yiu-Yeung

Chow Sing Sing is about to be kicked out of the Royal Hong Kong Police's elite Special Duties Unit. But a senior officer decides to give him one last chance: Star must go undercover as a student at the Edinburgh High School in Hong Kong to recover the senior officer's missing revolver.

The rivalry between two Chinese prison factions heats up as a seasoned inmate forms an alliance that could cost him more than his freedom.

A friendship is formed between an ex-gangster, and two groups of hitmen - those who want to protect him and those who were sent to kill him.

Ko Chow is an undercover cop who is under pressure from all sides. His boss, Inspector Lau, wants him to infiltrate a gang of ruthless jewel thieves; his girlfriend wants him to commit to marriage or she will leave Hong Kong with another lover; and he is being pursued by other cops who are unaware that he is a colleague. Chow would rather quit the force, feeling guilty about betraying gang members who have become his friends.

A young schoolgirl, Yuen Fong becomes caught in a tragic stranglehold of triad activity after she testifies in court over a triad beating. When this news reaches the triad leader Brother Smart, Yuen Fong must pay him protection money for what she has done as events begin to escalate.

A veteran inmate takes a newcomer under his wing as the pair confront both other violent inmates and the prison's corrupt wardens.