Bun, a schizophrenic, former police inspector comes out of retirement to help a rookie detective solve a complex murder case involving a missing colleague and a suspected policeman suffering from a multiple personality disorder.

A suspected criminal mastermind escapes from police custody, throwing the city into turmoil. With the police department now divided, rival police chiefs are forced to take their fight to the streets of Hong Kong with deadly consequences.

Rock, the director of a TV program about the supernatural, firmly believes in ghosts. He desperately wants to meet a real one, but little does he realise the consequences this will bring. Desperate to increase the viewership of his show, Rock meets Tincy, who is actually a female ghost. Together they develop a new program called Life or Death which becomes a big success. But soon Rock uncovers the conspiracy behind Tincy's death, and is framed for her murder. With his only possible saviour stuck in a performance, Rock only has one hour left to save his life.

Kung and Kin's rivalry goes way back to the seventies when they fought over the same girl, who eventually became Kung's wife. Now they run competing phone stores right across from each other on Mongkok's busiest street, and stretch their minds trying to outdo each other with crazy promotions.