Kim Yoo-jin, known professionally as Eugene, is a South Korean singer and actress. She is best known as a former member of the girl group S.E.S., which went on to become one of South Korea's best-selling artists. Following the group's disbandment in 2002, she subsequently left SM Entertainment and released two solo studio albums.

S.E.S. was a South Korean girl group formed in 1997 by SM Entertainment, featuring three members: Bada, Eugene, and Shoo. Their debut album I'm Your Girl sold 650,000 copies, becoming the third best-selling album by a female group in South Korea. Their follow-up albums, Sea & Eugene & Shoo in 1998, Love in 1999 and A Letter from Greenland in 2000 also became best-sellers.