In 1980s Hong Kong, troubled youth Chan Lok-kwun, a mainland refugee, struggles to survive in the Kowloon Walled City by joining underground fights. Betrayed by crime boss Mr. Big while trying to buy a fake ID, he steals drugs from him and seeks refuge in the Walled City, where he encounters Cyclone, a compassionate yet authoritative crime lord.
林峯
as Chan Lok-kwun
古天樂
as Cyclone
洪金寶
as Mr. Big
任賢齊
as Chau
劉俊謙
as Shin
黃德斌
as Tiger
伍允龍
as King
Tony Wu
as Twelfth Master
張文傑
as AV
郭富城
as Jim
Fish Liew
as Fanny
朱栢康
as Woman Beater
