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 "Seohyun"): Seo Ju-hyun (born June 28, 1991), known professionally as Seohyun, is a South Korean singer and actress.
Relevant evidence: Yes