Ong Seongwoo (옹성우), also known as Ong for its rarity, is a South Korean Singer and Actor under Fantagio Entertainment. He rose to fame when he competed in the 2nd season of Produce 101 and ranked 5th place on the final episode, qualifying him to be a member of the temporary group Wanna One. After the group's disbandment last December 2018, Seongwoo continued to promote as a soloist and actor.
Moreover, Ong Seongwoo was the lead character in the JTBC Youth Drama "The Moment of 18" which aired in July, 2019.
He made his solo debut on March 25, 2020 with his first mini album Layers.