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 of NCT U and one of the lead vocalist and rappers of NCT 127.

History on NCT Edit

Profile Edit

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

Discography Edit

Collaboration Edit

OST Edit

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 Edit

Album Song Writing Composer Arrange Ref.
NCT # 127 (NCT 127) (2016) Fire Truck

Filmography Edit

TV Shows Edit

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 Edit

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
Inkigayo SBS MC October 20, 2019-present (with Minhyuk of Monsta X & Naeun of April)

Radio Program Edit

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

Music Video Edit

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

 Endorsements Edit

Year Brand Notes
2020 Nature Republic with NCT 127


  • His MBTI result is ESTP.
  • Specialty: Singing, Rap, Piano, Basketball
  • Hobbies: 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
  • 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
  • Favorite Book Genre: Fantasy
  • Favorite Author: Agatha Christie
  • Favorite Musician: IU
  • 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 is and how he looks like a cartoon character.
  • He is very good at studying.
  • When he falls asleep, he always sleeps sideways and never facing up.
  • He sleeps while hugging his blanket not pillow.[1]
  • Mark says that Jaehyun is good at taking care of the younger members.
  • He was cast into SM Entertainment when he was in the 8th 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 3 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 6 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‘s 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 and Haechan before, but is currently sharing with Jungwoo.


Gallery Edit

Nct logo
To view the Jaehyun gallery, click here.


  1. NCT 127 NIMDLE
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