Choi Sulli (born March 29, 1994), better known as just Sulli, is a Korean pop singer and actress. She first debuted as a child actress in 2005 and then as a singer of quintet dance group F(x) in 2009. Sulli began acting professionally at the age of 11, when she was selected to play young Princess Sun-hwa in the SBS television drama, The Ballad of Seo-dong. A few months later, she made a cameo appearance in Love Needs a Miracle, another SBS television drama. In 2006, she made a small supporting appearance as the childhood crush of TVXQ's Micky in the theatrical drama Vacation. Sulli later landed a small role in Punch Lady and The Flower Girl is Here (2007) and also BABO (2008). She is the sworn sister to Super Junior's Kim Hee Chul, leading fans to dub them as 'Sulhee' siblings. It was revealed on radio star that Hee Chul is protective of Sulli because when she was young, he use to make her cry a lot.