Tong Shap Yat (Kevin Cheng) was a devoted adherent of Muay Thai, wishing to prove himself against the best practitioners of the art, he fought in underground matches in Thailand, and out of a desire to win accidentally kills an opponent.

During his time in prison his wife died of an untreated illness leaving Tong a lone parent and sole provider for his son.

With his stable depleted by injuries and defections, leaving him weak in some weight classes, Ko attempts to convince Tong to return to the ring.

The promised purse being enough to lift Tong from his hand-to-mouth existence as a security guard and odd-job man and allow him to better provide for his son.

A natural at the sport, Pat is persuaded to fight and falls in love with the experience; Muay Thai giving him a purpose and direction in life that he had previously lacked.