Kim Tae-yeon (born March 9, 1989), most often credited only as Taeyeon, is a South Korean singer.She debuted in 2007 as a member of South Korean girl group Girls' Generation under S. Entertainment, and has further participated in its subgroup TTS as well as S. Aside from group activities, she has also recorded tracks for various television dramas and movies as well as commercial films (CFs).In May 2012, Taeyeon, along with fellow Girls' Generation members Tiffany and Seohyun, formed a subgroup called Girls' Generation-TTS (or TTS), releasing their first mini-album titled Twinkle.The subgroup has a different musical direction and style concept from Girls' Generation, The two also had the duet "Lost in Love", which was featured on Girls' Generation's fourth Korean album, I Got a Boy.They released their sophomore EP, Holler, in September 2014; the album debuted at number one on both the Billboard World Albums chart During the promotion period, the three singers were also featured in the reality show, The Tae Ti Seo.The show took a more close-up and personal side of the three singers, revealing their normal everyday lives.Fellow Girls Generation member Tiffany commented, "I was roommates with Taeyeon and I was surprised when I came into the room and saw that all of Taeyeon’s belongings were cleaned out.” As a teenager, Taeyeon was inspired to become an entertainer by Bo A.
The lead single, "I", peaked atop the Gaon Digital Chart and has sold over one million digital copies.
In October 2015, Taeyeon debuted as a solo artist with the release of her first solo album, I, with the title track of the same name featuring Verbal Jint, to great commercial success.
The song received a total of 11 music program awards, and the album topped the Gaon Album Chart, becoming the best-selling album of October, and was named as the main contributor of S. Entertainment leading music sales for the fourth quarter of 2015.
However, she made a promise to musical director Lee Pil-ho that they would collaborate again after working with him on the Beethoven Virus OST.
He stated that he had not considered anyone else to sing this song.