Girls' Generation is South Korean.
Choi Soo-young . After returning to South Korea in 2004 , Sooyoung eventually became a member of girl group Girls ' Generation in 2007 . The group went on to be one of the best-selling artists in South Korea and one of South Korea 's most popular girl groups worldwide . Girls ' Generation , also known as SNSD , is a South Korean girl group formed by S.M. Entertainment . The group is composed of eight members : Taeyeon , Sunny , Tiffany , Hyoyeon , Yuri , Sooyoung , Yoona , and Seohyun . The Korean Wave ( , , a neologism literally meaning `` flow of Korea '' ) is the increase in global popularity of South Korean culture since the 1990s .