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.

Raymond Lam Fung

Chan Lok-kwun

Louis Koo

Cyclone

Sammo Hung Kam-Bo

Mr. Big

Richie Jen

Chau

Terrance Lau Chun-Him

Shin

Kenny Wong Tak-Ban

Tiger

Philip Ng Wan-Lung

King

Tony Wu

Twelfth Master

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