Ki Sung-joon is a retired South Korean footballer known for his versatility on the field. Born on January 24, 1984, he primarily played as a midfielder but was also effective as a defender. Throughout his career, he played for several clubs, including Seongnam Ilhwa Chunma and Incheon United, and made significant contributions to his teams. In addition to his club career, Ki represented the South Korea national team in various international competitions, including the FIFA World Cup. His skills and tactical awareness made him a valuable player, earning him recognition in both domestic and international football.