Ong Seong Woo is a South Korean singer and actor. He was born in Incheon, South Korea on August 25, 1995, and took his first steps into the entertainment world in 2017 when he participated in the popular survival reality program, “Produce 101, Season 2”. Placing fifth in the competition, he made his official debut as a member of the subsequent idol group, Wanna One, that same year. Taking part in various variety programs over the years, he made his debut as an actor in the 2019 coming-of-age television drama, “Moment of Eighteen”.