She also participated in the original and Korean versions of stage musicals including Moon Embracing the Sun, Gone with the Wind and Mamma Mia.

Seohyun was born Seo Ju-hyun on June 28, 1991,[2] in Doksan-dong, Geumcheon-gu, Seoul, South Korea,[3] and is the only child in her family.

Her parents did not encourage her to become a celebrity, but Seohyun credited them as the ones who helped her choose her career path by letting her experience different things.

[15][16] In April 2012, Seohyun, along with fellow members Taeyeon and Tiffany, formed a Girls' Generation subgroup named TTS.

[17] Their debut EP, Twinkle, met with much success and became the eighth highest selling album of the year in South Korea.

Director Bae Tae-sub said Seohyun's persona "perfectly paralleled that of her role" and "her understanding and expressiveness of the character exceeds those of a rookie actress".

[30] In January 2015, Seohyun was cast in the role of Scarlett O'Hara in the Korean version of Autant en emporte le vent, a French musical based on Gone with the Wind.

Seon Mi-gyeong of OSEN said that while Seohyun's performance cannot surpass that of Bada, who shared the same role, her "fierce voice" complemented and successfully expressed an arrogant Scarlett O'Hara.

[32] Kim Hyun-joong of Sports Chosun noted Seohyun's occasional "clumsy" acting, but compared her to Ock Joo-hyun during her rookie days and said that "her ability to bring emotion through song, the most important part of a musical, rivaled that of a veteran actor.

[49][50] In 2018, Seohyun was cast as the female lead in MBC's melodrama The Time as the character Seol Ji-hyun, a bright and optimistic woman who became depressed after the tragic death of her sibling.

[51][52] In September 2018, Seohyun announced her first fanmeeting tour, Memories, in Seoul, Bangkok, Taipei, Osaka and Hong Kong.

[53][54] Later that year, she starred in the JTBC television series Private Lives as Cha Joo-eun, a swindler who has to choose a deceptive path to survive in Korea.

She played the character of Jung Jiwoo, a competent public relations team member who accidentally found out her co-worker's BDSM desires.

[60] In June 2022, Seohyun starred in the KBS fantasy romance series Jinxed at First,[61][62] She played the character Lee Seul-bi, who has the special ability of seeing the future of any person she touches.

She played the character Nam Hee Shin, an independence activist disguised as the head of the Railway Bureau of the Japanese Government-General of Korea who has hidden her true identity.

[69] In 2020, Seohyun donated 100 million Korean won worth of feminine products to NGO Official Development Association Korea.

[72] From 2016 to 2018, Seohyun was selected as South Korean ambassador for hair care brand Pantene along with fellow member Yuri.