One Nite in Mongkok

Officer Milos's task force is assigned to the case when a gangster’s son is accidentally killed during a drunken dispute with a rival gang. He soon learns that a hitman has been hired to take out the rival gang leader. While Milo and his crew desperately try to find and stop the hired gun, fearing all-out war in the streets, Lai Fu, a smart but inexperienced killer from a small town on the mainland, arrives in Hong Kong to do his job.
(Source: IQ)