Eun Ji-won is a South Korean rapper, singer, actor and entertainer. He is the leader of the first generation idol group Sechs Kies (젝스키스).

Sechs Kies is a first generation South Korean boy band. Making their debut on April 15, 1997, they are one of the first K-pop idol groups, credited with pioneering the idol scene and fandom culture. The group consists of the following members, Eun Ji-won, Lee Jai-jin, Kim Jae-duck, and Jang Su-won.