Inseong is a vocalist in SF9 and an independently released solo recording artist. Known for his strong singing and stage presence, he also pursues musical theatre and individual performance opportunities. His solo EP Crossfade: was released in January 2026 and includes the single Mute is Off, which distinguishes his personal discography from SF9’s group releases.

SF9 debuted on October 5, 2016, with Feeling Sensation. The group’s discography spans dance-pop and R&B-influenced music, with a particular emphasis on its live choreography. INSEONG’s role in the collective is described here alongside relevant individual career milestones. Independently released music is distinguished from group singles and collaborative tracks.