2015–present: Debut with Seventeen and solo activities Seungkwan debuted as a member of the South Korean
boy band,
Seventeen with the
extended play 17 Carat on May 26, 2015. In 2018, he released the single "Kind of Love" for the soundtrack of the series
Mother. The song portrays a sorrowful love story with an acoustic sound. Alongside bandmates Hoshi and DK, Seungkwan created a subunit of Seventeen called BSS, or BooSeokSoon, a common nickname for the three members together. The group released their debut single "Just Do It" on March 21. That same year, Seungkwan was cast in the talk show
Unexpected Q. He was awarded the "Rookie (Music and Talk)" award at the
2018 MBC Entertainment Awards. In 2019, Seungkwan was cast in
Prison Life of Fools and in the
talk show Five Cranky Brothers. On September 7, 2020, Seungkwan released the single "Go" for the soundtrack of the series
Record of Youth. On January 29, 2021, Seungkwan participated in the soundtrack for the series
Lovestruck in the City with a song titled "The Reason". In 2021, Seungkwan was cast in the SM C&C television show
Job Dongsan, alongside
Kang Ho-dong and Super Junior's
Eunhyuk, and in TVING's
Idol Dictation Contest. Later, he appeared on
tvN's new badminton television show
Racket Boys, alongside Olympic champion
Oh Sang-uk,
Jang Sung-kyu,
Yang Se-chan among others. In January 2022, he was awarded the "Male Idol Entertainer" award at the 2022 Korea First Brand Awards, having been nominated in an earlier year. In September, he released a cover of
Harry Styles' "
As It Was" as an exclusive for
Spotify Singles. In July 2023, Seungkwan went on a health-related hiatus and returned to activities in September that year ahead of the release of
Seventeenth Heaven. In September 2023, the
Netflix reality show ''
The Devil's Plan'' was released, with Seungkwan having filmed it prior to his hiatus. In February 2024, Seungkwan released his first solo single titled "Dandelion". In March he went on to release "Lonely Stars" for the
Astra: Knights of Veda OST. On November 19, 2024, Seungkwan was made an honorary ambassador for
Jeju Island, his hometown. In February 2025, he released "Somewhere in this Universe" for the OST of
When the Stars Gossip. On May 17, as a long-time volleyball fan, Seungkwan was featured as a guest commentator for
Kim Yeon-koung's final volleyball match, titled "KYK Invitational". In September 2025, it was announced that Seungkwan joined Kim for
MBC's new variety show
The Wonder Coach, as team manager. In January 2026, he and DK debuted as
DK X Seungkwan with EP titled
Serenade. ==Other ventures==