Eun Ji-won (born June 8, 1978) is a Korean rapper, host, dancer, composer and former leader of the first generation idol group Sechs Kies (젝스키스). Eun was the oldest member of the group, and pursued a solo career in 2001 with his first single ("A-Ha"). He returned to the K-pop scene in 2007 with the Latin-hip-hop single, "Adios". The following year, Eun released an album (G Code) and a single ("Dangerous"). In addition to singing, he appeared on KBS' Happy Sunday: 1 Night 2 Days and now co-hosts the health program Vitamin and the network's song-contest program Saturday Freedom: Immortal Songs 2.