Jeong Yun-o, professionally known as Jaehyun. is a South Korean singer. He is a member of the South Korean boy band NCT and its sub-units NCT 127 and NCT DoJaeJung.

Dear.M (Korean: 디어엠) is a 2022 South Korean television series starring Park Hye-su, Jeong Jae-hyun, Roh Jeong-eui, Bae Hyun-sung, Woo Da-vi and Lee Jin-hyuk. It is the spin-off of the webseries Love Playlist. Directed by Park Jin-woo and Seo Joo-wan, and written by Lee Seul, the series follows the university life of four students at Seoyeon University as they search for "M" — the writer of a community article.