Ong Seong Wu (Korean: 옹성우 Ong Seong Wu, born August 25, 1995) is a South Korean singer, dancer, actor, host, and model, formerly known in translation as Yong Sung Woo. He debuted as a member of the limited group Wanna One through the TV audition program 'PRODUCE 101 Season 2', serving as the lead singer and lead dancer.
