Ong Seong-wu (born August 25, 1995 in Incheon, South Korea) is a South Korean singer under Fantagio Entertainment. He is a member of the South Korean boy group Wanna One, under YMC Entertainment and CJ E&M. He is best known for finishing fifth in the final broadcast of the second season of Mnet's reality show PRODUCE 101 Season 2, with a total of 984,756 votes. Read more on Last.fm