Jeong Yoon-Oh (born Jeong Jae-hyun (정재현), February 14, 1997), known professionally as Jaehyun, is a South Korean singer-songwriter, actor and rapper. He is a member of the South Korean boy band NCT and its sub-units NCT 127 and NCT DOJAEJUNG. He made his solo debut on August 26, 2024, with the studio album J.