Set amid the chaos of pre-revolutionary China, small time thief, Sing, aspires to be one of the sophisticated and ruthless Axe Gang whose underworld activities overshadow the city. Stumbling across a crowded apartment complex, aptly known as "Pig Sty Alley", Sing attempts to extort money from one of the ordinary locals, but the neighbors are not what they appear. Sing's comical attempts at intimidation inadvertently attract the Axe Gang into the fray, setting off a chain of events that brings the two disparate worlds face to face.