Do san

Ko Chun, a world-famous gambler, loses his memory in an accident and starts behaving like a child. Little Knife, an amateur gambler, offers him shelter and realizes that he has a penchant for gambling. Ko Chun arrives in Tokyo for a match with Ueyama, the country's top ranked gambler, and later agrees to help Ueyama take revenge on Chan Kam-sing, a famous Singaporean gambler. Along the way, Ko Chun's childlike state is mistaken by his cousin Ko Yee, who seeks to exploit his gambling talent. After Ko Chun's memory is restored, he reveals to Little Knife that he knew about Ko Yee's betrayal all along and promises to make it up to him by taking him to Las Vegas as his gambling partner.