Girls' Generation has girls.
Choi Soo-young ( born February 10 , 1990 ) , 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 . Girls' Generation . The group is composed of eight members : Taeyeon , Sunny , Tiffany , Hyoyeon , Yuri , Sooyoung , Yoona , and Seohyun . Im Yoon-ah ( Hangul : 임윤아 born May 30 , 1990 ) , better known by the mononym Yoona , is a South Korean singer and actress . She debuted as a member of girl group Girls ' Generation in August 2007 , who went on to become one of the best-selling artists in South Korea and one of South Korea 's most popular girl groups worldwide . Kim Hyo-yeon . She debuted as a member of girl group Girls ' Generation in August 2007 , who went on to be one of the best-selling artists in South Korea and one of South Korea 's most popular girl groups worldwide . Kim Tae-yeon . She had been a trainee at S.M. Entertainment 's Starlight Academy during her middle school years before debuting as a member of the agency 's girl group Girls ' Generation in 2007 . Since then , she has risen to prominence due to the group 's success in the Asian music scene and further participated in the agency 's projects Girls ' Generation-TTS and SM the Ballad . Her second extended play , Why ( 2016 ) , charted at number one on the Gaon Album Chart and yielded two Gaon Digital Chart top-ten singles `` Starlight '' and `` Why '' . Her debut studio album My Voice ( 2017 ) and its two singles `` Fine '' and `` Make Me Love You '' achieved similar success . Following her debut , she was awarded Best Female Artist at the Mnet Asian Music Awards . In 2016 , Gallup Korea ranked her as the most popular idol of 2016 ; the year before she was ranked third . Also in 2016 , Forbes Korea listed her among their Top 40 Power Celebrities of the year . Taeyeon is renowned for her vocal abilities : she was voted in a survey by 40 music industry officials as the best K-pop vocalist in October 2015 , and as the best female vocalist by twenty music companies in April 2016 . Kwon Yu-ri ( born December 5 , 1989 ) , better known by the mononym Yuri , is a South Korean singer and actress . She debuted as a member of girl group Girls ' Generation in August 2007 , who 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 , she has participated in various television dramas , including the television dramas Fashion King ( 2012 ) , Defendant ( 2017 ) and Neighborhood Hero ( 2016 ) , and the film No Breathing ( 2013 ) . She also joined the web drama Gogh , The Starry Night . Seo Ju-hyun ( born June 28 , 1991 ) , known professionally as Seohyun , is a South Korean singer and actress . She debuted as a member of girl group Girls ' Generation ( and later its subgroup TTS ) in August 2007 , who 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 , she has established herself as an actress , notably through her participation in the original and Korean versions of stage musicals including Moon Embracing the Sun , Gone with the Wind and Mamma Mia . She also starred in the drama `` Moon Lovers : Scarlet Heart Ryeo '' . She debuted as a solo artist with her debut mini album , Do n't Say No , on January 17 , 2017 , making her the third Girls ' Generation member to debut as a solo artist . Lee Soon-kyu ( born May 15 , 1989 ) , known professionally as Sunny , is an American singer and actress currently based in South Korea . She debuted as a member of girl group Girls ' Generation in August 2007 , who 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 , Sunny has participated in numerous side projects including original soundtracks , television variety shows , musical acting and radio hosting . Tiffany Hwang . Born and raised in California , she was discovered by South Korean entertainment agency S.M. Entertainment at the age of fifteen and subsequently moved to South Korea . After four years of training , Tiffany debuted as a member of girl group Girls ' Generation ( and later its subgroup TTS ) in August 2007 , who went on to be one of the best-selling artists in South Korea and one of South Korea 's most popular girl groups worldwide .