Fai (Nick Cheung), a legendary triad figure, was convicted and sent to prison for slaughtering a bunch of people. 30 years later after his release from prison, the city of Mongkok has totally changed and he has almost forgotten his way back home. Fai's buddy porky, (Willie Wai) is due to take over as head of their triad gang after years of service, but his personality is not suited to be a leader. Meanwhile, Porky has iterest in Pamela (Monica Mok) and had made sexual advances towards her only to have Fai rescued her on a few occasions causing friction between them. Fai will he ever leave this city of Mongkok prison?