The decadent middle-aged brothers, Ah Song (Lin Jiadong) and Murong Hui (Richie Ren), plan a robbery but are accidentally disrupted by the gangster Mei Lantian (Aaron Kwok). By chance, the three of them team up temporarily and are about to get the huge sum of money, but someone else gets there first. At the same time, female police detective Jiang Jie (Maggie Cheung) also locks on the three of them. For a while, the gangsters have their own ulterior motives. Under the rule of "I rob, you rob me", a bag of money triggers a series of accidental events...