Jeong Yuno (정윤오) (born Jeong Jae-hyun (정재현)), better known by his stage name JAEHYUN (재현), is a South Korean singer-songwriter, dancer, and MC. He is a member of the boy group NCT and its units NCT U and NCT 127.
He was born on February 14, 1997, in Seoul, South Korea.
In December 2013, he was introduced as part of SM's pre-debut training team SMROOKIES, and at that time also became a new MC on Show Champion, along with a fellow rookie DOYOUNG.
In April 2016, Jaehyun officially debuted as a member of NCT as a member of it's first unit NCT U with the single "The 7th Sense". In July, he was announced to be a member of the 2nd unit, NCT 127. He later debuted in NCT DoJaeJung in April 2023. His own fandom name is called “Valentine’s”