"So let’s become best friends that don’t get ashamed of each other but cherish and have plenty of care for each other." —Taeyeon Kim Taeyeon (born March 9, 1989), known professionally as Taeyeon, is a South Korean singer and actress. She is the leader and lead vocalist of K-pop girl groups, Girls' Generation and TaeTiSeo as well as a solo singer and member of SM The Ballad. Taeyeon trained in singing, dancing and acting for four years and three months before she began her career in 2007. She made her solo debut on 8 October 2015 on M Countdown.