Lau Kar-Wing plays "Nobody", an orphan who grows up stealing food to survive, learning some meagre skills as a con artist. When he meets a true master con artist, he begs to become a pupil and learn some tricky kung fu. The pair are later separated, and Nobody finds another master to learn more deadly skills.

Chief B (Danny Lee) is an unconventional CID member who relies more on instincts rather than by the book to resolve situations. He's a down-to-earth fellow who's a mamma's boy, not too well-educated, and an outstanding member of the CID. Police Officer Kit (Eddie Chan) has just been promoted from the rank-and-file to CID, and at the same time is studying for the test to become an Inspector. Chief B takes him under his wings to investigate numerous gang-related cases. Kit, previously a by-the-book type of police officer, learns a lot from Chief B.

Knowing that he's dying from cancer, Lam feels a responsibility to come up with sufficient funds quickly so that his younger brother Wai-leong can complete medical school.

Buddy cops Porky and Big Mouth are promoted to the anti-prostitution division after solving a robbery case.

Hung Tai-Kong aka Rice Pot and Chan Yin-Tung aka Chimney are two friends who work with their master Kam Ming and his daughter Ann as a team of pickpockets.