A Sheng used to be a gangster in Zhongshan District but he was imprisoned for 12 years to save his brother Sha Ou. After being released on parole, he sets foot on this familiar territory again only to find that Sha Ou is now the top dog. At this time, the young and ruthless "Monkey" has murdered the son of Sha Ou's benefactor. Sha Ou sends his men to ambush Monkey to no avail. With the two gangs at war, the only person who can help Sha Ou get justice is A Sheng.