Seohyun acts.
Seo Ju-hyun -LRB- born June 28 , 1991 -RRB- , known professionally as Seohyun , is a South Korean singer and actress .. She debuted as a member of girl group Girls ' Generation -LRB- and later its subgroup TTS -RRB- 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 .. South Korea. South Korea. TTS. Girls' Generation-TTS. best-selling artists. List of best-selling artists in South Korea. 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 .. Moon Embracing the Sun. Moon Embracing the Sun. Gone with the Wind. Autant en emporte le vent. Mamma Mia. Mamma Mia! ( musical ). 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 .