In a tea house in Hong Kong, Officer "Tequila" Yuen (Chow Yun-fat) and his partner Benny (Bowie Lam), attempt to arrest a group of gun smugglers while they are making a deal. After an ambush from another gang member, a fierce gun battle breaks out. The gangsters are defeated but several police officers are badly wounded and Benny is killed. Angered by the death of his partner, Tequila decides to kill the gangster who ambushed them rather than arrest him. This angers his boss, Officer Superintendent Pang (Philip Chan), who wanted the gangster alive to testify. Tequila is subsequently ordered off the case for his misdemeanor.