TONG SHAP-YAT (Kevin Cheng) enters the underground boxing scene for money when he is learning Thai boxing with his senior brother KO WAI-TING (Wong Tak Bun) in Thailand, a decision he regrets for the rest of his life. In order to turn over a new leaf, he withdraws from the boxing scene and finds himself a job as a security guard at a sports goods company. His outspokenness attracts the attention of his supervisor CHAI PAK-FAI (Selena Li).