Question: 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, is composed of three Girls' Generation members: Taeyeon, Tiffany, and which South Korean singer and actress, known professionally as Seohyun, born in which year ?
Sentence (from "Girls' Generation-TTS"): The group has released three EPs: "Twinkle" (2012), "Holler" (2014), and "Dear Santa" (2015).
Relevant evidence: No