'''Girls' Generation-TTS (Hangul: \uc18c\ub140\uc2dc\ub300-\ud0dc\ud2f0\uc11c, also known as TTS, TaeTiSeo, or Girls' Generation-TaeTiSeo''') is a subgroup of South Korean girl group Girls' Generation, formed by S.M. Entertainment in 2012. It is composed of three Girls' Generation members: Taeyeon, Tiffany, and Seohyun.[http://media.daum.net/entertain/enews/view?cateid=1033&newsid=20120419083904397 Subgroup "TTS", formed by Girls' Generation's Taeyeon, Tiffany & Seohyun, debuts in May (in Korean)] Daum.net (April 19, 2012). Retrieved on April 20, 2012. The group released their debut album, Twinkle, in 2012 and released a second one, Holler, in 2014.