Eun Ji-won (born June 8, 1978) is a South Korean rapper, host, dancer, composer and former leader of the first generation idol group Sechs Kies (젝스키스). After the group's disbandment in 2000, Eun pursued a solo career in 2001 with his first single ("A-Ha") and has mainly focused on hip-hop ever since. In addition to his music career, he also appeared on the variety show, Happy Sunday: 1 Night 2 Days and the hit cable TV show, Reply 1997.