– He ended PD101 on the 5th rank with a total of 984,756 votes
– He went to Hanlim Multi Art School in Seoul
– He was a trainee at Fantagio for 8 months
– He is a very good dancer, especially popping and freestyle
– He can play the drums
– He became well-known for 'clapping the slate' before starting rehearsals
– Seungwoo used to have multiple part-time jobs. He used to work at a cafe, and as a model
– Daehwi said Seungwoo and Daniel are dangerous. He said we can see it by their solo cam (interview on pd101 called 'We ask, You answer!)
– Ong Seongwoo and BTOB's Sungjae were classmates.
– When Wanna One moved to the dorm, they chose the rooms after playing 'Rock-Paper-Scissors'.
– Seungwoo, Daniel, and Jisung share a room. (Wanna One's reality show "Wanna One Go" ep. 1)
– Seongwoo and Woojin's thumb are both flexible. They can bend it more than a normal person can. (Show Champion Behind)
– His role model is EXO's Kai. (Happy Together)
– Seongwoo's surname 'Ong' is a rare surname in Korea. He never have met one and he said there was never a person who got his name after hearing it once (Produce 101 S2 Ep 1)
– Ong and Astro's Jin Jin attended the same school but Ong is a senior. From there, they become close to each other.
