The Walled City was once a place out of official control. Cheng Yuan-lung (Kwan Hoi- shan) was a Walled City gambling house boss. He left his sons Chia-chin (Kao Fei) and Chia-kang (Chien Hsiao-hou) to his friend, Chiptooth (Pai Wen-piao), when he was killed. Chia-chin grew up and avoided himself from the sins. However, Chia-kang mixed with a gang of hooligans and made his classmate Mei-ling (Liu Li-ling) pregnant, eventually leading to Mei-ling's death by falling off a rooftop accidentally. Mei-ling's father, the fiery-tempered Inspector Chang (Wang Lung-wei), couldn't wait to take horrible revenge on Chia-chin and Chia-kang...