Jung Young Hoon (정영훈), also known as Ooon, is a South Korean singer, dancer, and actor under Dream Passport Entertainment. He first debuted as the leader and main dancer of the boy group Halo until their disbandment in 2019. Ooon then participated in the Japanese version of the hit survival program Produce 101, together with fellow Halo members Heecheon and Yoondong. However, the three had to leave the show due to personal reasons.
In 2020, Ooon became a member of the Japanese-South Korean boy group ORBIT.