Claim: Girls' Generation is South Korean.

Choi Soo-young -LRB- born February 10 , 1990 -RRB- , better known by the mononym Sooyoung , is a South Korean singer and actress . She was a part of the short-lived Korean-Japanese singing duo , Route θ , during 2002 in Japan . 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 . Apart from her group 's activities , Sooyoung has also starred in various television dramas such as The 3rd Hospital -LRB- 2012 -RRB- , Dating Agency : Cyrano -LRB- 2013 -RRB- , My Spring Days -LRB- 2014 -RRB- and 38 Revenue Collection Unit -LRB- 2016 -RRB- .