Kim Taeyeon (born March 9, 1989), known simply as Taeyeon is a South Korean singer. She is the leader and main vocalist of the girl group Girls' Generation and is also a member of the sub units Girls' Generation-TTS and Girls' Generation-Oh!GG and the SM the Ballad project. Taeyeon is one of the most successful soloists in South Korea, along with Lee Hyori, BoA and Hyuna.