NCT Wiki
NCT Wiki

Jeong Yun-o (Hangul: 정윤오) (born Jeong Jae-hyun; Hangul: 정재현) referred to as Jaehyun (Hangul: 재현) or Jay (in English) is a South Korean singer-songwriter, actor and rapper born in Seoul on February 14, 1997. He is one of the main vocalists and lead dancers of NCT U and a main vocalist, lead dancer, and sub rapper of NCT 127.

History on NCT


  • Stage Name: Jaehyun (재현)
  • Zodiac Sign: Aquarius
  • Position:
    • Main Vocalist
    • Lead Dancer
    • Lead Rapper
  • Nickname: Woojae, Jeffrey, J, Jeong Jaeyuk, Valentine Boy, Umchinah, Bbang Jae, Memory Manipulator, Peaches, Nation's first love, Jayhyen, Cha Minho, Jae, Yoonoh, Jay Hun




Year Album Song Note
2019 Best Mistake OST "New Love" with Doyoung


= Participates as writing/composer/arrange ✖ = Not participated as writing/composer/arrange

NCT Discography

Album Song Writing Composer Arrange Ref.
NCT # 127 (NCT 127) (2016) Fire Truck
NCT Resonance Pt. 1 (NCT U) (2020) Dancing In The Rain



Year Title Channel Role Note
2021 Dear. M KBS2 Cha Minho, main character Unaired

TV Shows

Year Title Channel Role Note
2014 EXO 90:2014 Mnet SM Rookies Member Pre-debut
2017 Law of the Jungle in Fiji SBS Cast Member
Family Discovery KBS2 Guest with Doyoung Chuseok Special
2018 Hello Counselor Guest with Doyoung Ep. 358
Happy Together Guest with Taeyong

Hosting Program

Year Title Channel Role Note
2015 Show Champion MBC Music MC January 21 – July 1 (with Doyoung)
2016 M Countdown Mnet Weekly Guest MC August 18 (with Doyoung)
2017 February 16 (with Seulgi & Wendy of Red Velvet)
June 15 (with Naeun of April & Wonpil of Day6)
2018 March 1 (with Taeyong)
March 29 (with Doyoung)
Global MC May 24 (with Doyoung & Yuta)
The Show SBS MTV Special MC December 4 (with Doyoung)
2019 The Show SBS MTV Special MC June 11
2019 – 2021 Inkigayo SBS MC October 20, 2019 - February 28, 2021 (with Minhyuk of Monsta X & Naeun of April)

Radio Program

Year Name Channel Role Note
2017-2019 NCT's Night Night! SBS Power FM Radio DJ with Johnny

Music Video

Year Title Artist MV Note
2017 The Little Match Girl Baek A Yeon x Wendy (Red Velvet) Official Video


Year Brand Notes
2020 Nature Republic with NCT 127


  • Specialty: Singing, Rap, Guitar, Piano, Basketball
  • Hobbies: Playing the Guitar, Playing the Piano, Playing Sports, Watching movies, Listening to music, Watching Videos, Reading Fashion Magazine
  • Education:
    • Shindong Elementary School (Graduated)
    • Shindong Middle School (Graduated)
    • Apgujeong High School (Transferred)
    • School of Performing Arts Seoul (SOPA) (Broadcasting Arts) (Graduated)
  • Likes: Musical movies, Pikachu, Pokemon, Charmander, thriller and horror movies,
  • Dislikes: Raisins, trot music, being late or tardy
  • Favorite Drinks: Café Americano
  • Instruments: Guitar, Piano
  • Favorite Foods: Meat, spicy pork, peach, kimchi, and green tea ice cream
  • Favorite Accessory: Bracelets
  • Favorite Season: Spring
  • Favorite Weather: Snowy
  • Favorite Aroma: Lavender
  • Favorite Book: Courage to be Disliked by Fumitake Koga and Ichiro Kishimi
  • Favorite Book Genre: Fantasy
  • Favorite Author: Agatha Christie
  • Favorite Musician: IU and Cigarettes After Sex
  • Favorite Music Genre: Hip-Hop
  • Favorite Actor: Leonardo DiCaprio
  • Favorite Movie: Beauty and the Beast
  • Favorite Movie Genre: Thriller
  • Favorite Variety Show: The Return of Superman
  • Favorite Avenger: Captain America
  • Favorite Sport: Basketball
  • Favorite Color: White and Blue
  • Favorite Flower: Rose
  • Favorite Holiday: Christmas
  • Ideal Type: Women with straight and long hair.
  • He speaks fluent English because he lived in Connecticut, USA for 4 years.
  • His nickname, “Casper", was given to him because of how white his face was and how he looked like a cartoon character.
  • Jaehyun was introduced as an SM Rookies member, along with Irene and Lami, on December 10, 2013.[1]
  • He is good at studying.
  • When he falls asleep, he always sleeps sideways and never facing up.
  • He sleeps while hugging his blanket, not a pillow.[2]
  • Mark says that Jaehyun is good at taking care of NCT's younger members.
  • He was cast into SM Entertainment when he was in eighth grade.
  • When he was younger, he would have a talkative personality at home, but at school he was very shy.
  • He spent a lot of time alone at school when he was younger.
  • When he was younger, he dreamed of becoming an architect.
  • He wants to travel around the world.
  • He is the member who has the best alcohol tolerance, up to three bottles of Soju.
  • He sets the highest bowling score in the '2019 Idol Star Athletics Championship (ISAC)' in just 3 weeks of practicing. He also impressed viewers by having six consecutive strikes and ultimately having the highest score with 243.
    • His bowling segment recorded the highest viewer rating on the first day of the '2019 Idol Star Athletics Championship (ISAC)', which hit up to 7.2%.
  • He was a radio DJ alongside Johnny in NCT Night Night (from March 20, 2017 to January 27, 2019).
  • He says his body secret is that he has lots of hair.
  • He eats a lot (and sometimes he steals other members food too).
  • He's in a group chat with GOT7‘s Bambam and Yugyeom, BTS‘ Jungkook, SEVENTEEN‘s Mingyu, The8 and DK, and ASTRO‘s Cha Eunwoo (the ’97 liners).
  • Jaehyun and Seventeen’s DK went to the same school. In a radio interview, DK said that back then he didn’t dare to speak to Jaehyun because he was too handsome.
  • Jaehyun is the one who actually raised a hedgehog, but only lasted for a month as it was too untamed than he first thought it would be.
  • When asked who he would like to switch bodies with, he said he wouldn't switch bodies with anyone.
  • He has been roommates with Taeyong, Haechan, and Jungwoo before.[3]
  • He collects vinyl records.
  • His favorite word is "believe" because it is important to believe in yourself.[4]
  • His Harry Potter house would be Slytherin.[5]
  • Jaehyun said when there is a schedule, he usually drinks 3 cups of coffee a day, but when there isn't one he would drink one.[5]
  • His favorite sports team when he was young used to be the LA Lakers.[5]
  • His favorite basketball player is Michael Jordan.[5]



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To view the Jaehyun gallery, click here.