Hyun Sung Joo is a South Korean professional poker player. He graduated from Yongin Hankuk University of Foreign Studies Affiliated High School and later obtained a bachelor's degree in Indian Language from Hankuk University of Foreign Studies. He has won numerous awards and championships, and has been active as a team pro in the WPL (Winjoy Poker League) since 2022. He first appeared on TV as a contestant on the show "Bloody Game Season 2".