After spending 13 years in jail for killing one of his opponents Chat Chai in the dressing room, Mong Fu, a washed up Muay Thai kickboxer returns to Thailand to look for his old girlfriend Pim. Upon arrival in Bangkok, he finds out that she died and that he has a 14 year old daughter. He finds the orphanage and meet his daughter and starts a relationship with sister Mioko, the nun who runs the orphanage. His past comes back to haunt him when he is forced to fight the current champion who wants to avenge Chai, or get banned from Bangkok....