Adapted from a true story, it happened on the beautiful PP Island in Thailand, where boxers from all over the world gathered to challenge the Muay Thai champion. The protagonist of the story, Ken, grew up in an orphanage. His father died in a boxing match. When he grew up, Ken vowed to avenge his father. His Muay Thai master was worried that he would repeat the same mistake, so he took him away from the right and wrong places to concentrate on martial arts. Many years later, Ken returned to PP Island, but the island was still dominated by the evil force K-1, who was also the enemy who killed his father. Can Ken learn from his master's lesson that the true meaning of Muay Thai is not to knock down the opponent, but to make the opponent lose with conviction.