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. Due to her great vocal ability and stage presence on the show and other variety programs, she has been labeled as the Korean Beyoncé by some singers within country. In March 2011, Hyolyn was a guest on Strong Heart where she revealed that she was born prematurely and weighed in at 4.2 kg (about 9 lbs) at birth. During her mother's pregnancy, water had filled Hyolyn's stomach, which led her to become a premature birth. Bile was unable to be passed through her intestines, which eventually damaged her liver, causing a biliary atresia. Although the required surgery had low chances of sustaining life, Hyolyn was able to survive the 10-hour long surgery. A year later, however, she was diagnosed with intussusception (a medical condition where parts of the intestine folds over into another section of the intestine) and received surgery for enterectomy. Hyolyn debuted with SISTAR in 2010, with the single "Push Push (푸쉬푸쉬)". On October 17, 2011, she released featured single "Ma Boy 2" with Electroboyz. As an MBC 2012 Lunar Year special, the variety show We Got Married spin-off "Pit-a-Pat Shake" aired its pilot episode featuring virtual idol couples experiencing dating life. Hyolyn's partner was revealed to be Super Junior's Sungmin. In the pilot, Sungmin and Hyolyn performed traditional Korean opera. Recently, Hyolyn has begun an acting career starring in the KBS drama “Dream High Season 2” as Nana, a famous idol from the fictional girl group HershE. In 2015, Hyolyn officially debuted as a rapper in Unpretty Rapstar 2.