Ong Seong Woo 옹성우 is an idol and actor in South Korea under Fantagio. He graduated from Dong Seoul University as a performing arts major. First notice him through a survival show Produce 101 Season 2 and debut as Wanna One. After disbandment, he debuts as a soloist and did his first acting role in Moment of Eighteen.
Birthday: 25 August 1995