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Jeong Yun-o, born Jeong Jae-hyun on February 14, 1997, is a South Korean singer known professionally as Jaehyun. He is a member of the boy band NCT and its sub-units NCT 127 and NCT DoJaeJung. He was introduced as a trainee under SM Rookies in December 2013. Jaehyun debuted in April 2016 as part of NCT U and in July 2016 as a member of NCT 127. He joined NCT DoJaeJung in April 2023. In 2024, he released his solo debut album J, which includes the singles 'Roses,' 'Dandelion,' and 'Smoke.' He has also released two singles, 'Forever Only' and 'Horizon,' as part of the NCT Lab project. Outside of music, Jaehyun hosted the radio show NCT Night Night from March 2017 to January 2019 and the television program Inkigayo from October 2019 to February 2021. He made his acting debut with a leading role in the college romance television series Dear.