He is a member of the South Korean boy band Seventeen, its vocal team, and the sub-unit BSS alongside Hoshi and DK.

[3] Growing up, he participated in children's songs festivals held at his school, where a teacher recorded him singing and posted it online.

[8] Alongside bandmates Hoshi and DK, Seungkwan created a subunit of Seventeen called BSS, or BooSeokSoon, a common nickname for the three members together.

[16] 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.

[17][18] 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.