In May 2012, Taeyeon, along with two of her bandmates, Tiffany and Seohyun, formed the Girls' Generation-TTS (or TTS) sub-group, releasing their first EP titled, "Twinkle". The sub-group has a different concept and style from Girls' Generation placing its focus on the vocal capacity of each member, while the latter stands out in their songs and performances. The three members also became hosts to the MBC music program, "Show! Music Core", from February 2012 to April 2013.