Eun Ji Won (born June 8, 1978) is a Korean rapper, Host, dancer, composer and former leader of Korean Hip hop group Sechs Kies (젝스키스). Sechs Kies was divided into The Black Kies, which were the three rappers and The White Kies which were the vocalists. Eun Ji Won was the leader for The Black Kies and rapper and leader of the group Sechs Kies.
He was the oldest member in the group. Eun Ji Won has pursued a solo career since 2001 with his first single track "A-Ha". He recently returned to the K-pop scene in 2007 with the Latin-hip-hop single track titled "Adios". A year later in 2008, he returned with a new single album G Code with the title track being "Dangerous", also with a Latin-hip hop rhythm. Besides working as a singer, he currently appears as a member on KBS' reality-variety show Happy Sunday: 1 Night 2 Days.
Eun Ji Won recently wedded with a two-year-older South Korean woman from Hawaii whom he had met 13 years ago during his study abroad.