Which performer on the EP "Twinkle" also performed on the Korean stage musical version of "Mamma Mia"?
Girls' Generation-TTS Girls' Generation-TTS (, 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. The group has released three EPs: "Twinkle" (2012), "Holler" (2014), and "Dear Santa" (2015).
Kei (singer) Kim Ji-yeon (; born March 20, 1995), commonly known by her stage name Kei, is a South Korean singer and actress. She made her debut as a main vocalist of South Korean girl group Lovelyz in 2014. She made her acting debut as the female lead in the web drama "Matching! Boys Archery" in 2016.