Ong Seong Wu, born August 25th, 1995, in Incheon, South Korea, is a Korean male pop singer, model, actor, and member of the male group Wanna One. On March 9th, 2017, he made his official public appearance as a trainee on "M Countdown". On April 7th, he appeared in the Mnet reality show "Produce 101 Season 2" and achieved fifth place. In the same year, he made his debut with the Korean male group Wanna One.