Jeong Sewoon (정세운) is a South Korean singer, songwriter and composer under Starship Entertainment. Sewoon made his first public impression on the second season of Produce 101, representing Starship Entertainment. Unfortunately, he was eliminated in the final round, ranking twelfth, not making the lineup of Wanna One.

Sewoon made his solo debut in 2017 with The 1st Mini Album, Pt. 1: Ever, right after WANNA ONE. He was also a member of Starship and BRAND NEW MUSIC’s project group YDPP, which lasted for a year before ultimately disbanding.