Seo Ju-hyun, known professionally as Seohyun, is a South Korean singer, actress and songwriter. She debuted as a member of girl group Girls' Generation in August 2007, which went on to become one of the best-selling artists in South Korea and one of South Korea's most popular girl groups worldwide. Seohyun released her first extended play Don't Say No in 2017. She left SM Entertainment later that year, although she remains as a member of Girls' Generation. She joined Namoo Actors in 2019.

Girls' Generation, also known as SNSD, is a South Korean girl group formed by SM Entertainment. The group is composed of eight members: Taeyeon, Sunny, Tiffany, Hyoyeon, Yuri, Sooyoung, Yoona, and Seohyun. Originally a nine-piece ensemble, member Jessica departed from the group in September 2014. Among the most known South Korean figures and successful K-pop groups worldwide, Girls' Generation has earned numerous accolades and the honorific nickname "The Nation's Girl Group" in their home country.