Kim Hyo Jung (stage name: Hyolyn; Hangul: 효린; born December 11, 1990 in Incheon, Seoul, South Korea) is a South Korean idol singer, rapper and actress, as well as leader of the South Korean idol group SISTAR that debuted in 2010 and their sub-unit SISTAR19. In 2013, she debuted as a solo artist with the album, "LOVE & HATE". Hyolyn appeared in the variety show "Immortal Song 2" from June until September of 2011, and was crowned the top winner in the pilot episode.