Seo Ju-hyun , known professionally by her stage name Seohyun, is a South Korean singer, actress ,model, Song-writer and presenter. She is a member of South Korean girl group Girls' Generation and the leader of its subgroup TTS. Seohyun was born Seo Ju-hyun on June 28, 1991, in Seoul, South Korea, and is the only child in her family. Her mother was...