Tong Shap Yat was a devoted adherent of Muay Thai. To prove himself against the best, he fought in underground matches in Thailand, and accidentally kills an opponent. Jailed for manslaughter for years, Tong returns to Hong Kong a changed man. His wife had died from illness, leaving Tong a lone parent/sole provider for his son. A remorseful Tong attempts to wash his hands of Muay Thai and seeks to lead a peaceful life. Ko Wai Ting is Tong Shap Yat's friend and students in the same Muay Thai gym. Over the years, Ko has built a successful Muay Thai business, on the success of his own and his stable of fighters. With his stable depleted by injuries/defections, Ko attempts to convince Tong to return to the ring. The prize money will allow him to better provide for his son. Pat Ka Shing is saved by Ko Wai Ting from a beating. He joins Ko's gym to learn to protect himself. Pat is persuaded to fight in competitions, and Muay Thai giving him a purpose/direction in life that he had lacked.