2015: SIXTEEN, TWICE
On May 5, 2015, she became a contestant on JYP's newest survival show, SIXTEEN. She finished the survival in 3rd place, hence becoming a member of the girl group TWICE. They officially debuted on October 20, 2015 with their first mini album, The Story Begins.
On June 22, 2016, SBS revealed that Jeongyeon, alongisde her sister Gong Seung Yeon and actor Kim Min Su, would be the new MCs for the music show Inkigayo. She worked on the music show until January 22, which was her last episode. On that day, Jeongyeon posted a message on Twitter to thank fans for supporting her.
On October 17, 2020, JYPE announced that Jeongyeon would be sitting out of promotions for Eyes Wide Open due to experiencing psychological anxiousness. She will take time to have 'sufficient rest and absolute stability, accompanied by professional medical measures'.
- "My Dream Class OST" ("Like A Star" with Gong Seung Yeon) (2018)
- SIXTEEN (Mnet, 2015) - contestant
- Muscle Queen Project (KBS, 2016) - contestant
- Law of the Jungle (SBS, 2016)
- Inkigayo (SBS, 2016–2017) - host
Music video appearances
- GOT7 - "Girls Girls Girls" (2014)
- miss A - "Only You" (2015)
- J.Y. Park - "Fire" (feat. Conan O'Brien, Steven Yeun, & Jimin Park) (2016)
Producing and writing credits
|2018||"Sweet Talker"||What is Love?|
|"Lalala"||Yes or Yes|
|2020||"Sweet Summer Day"||More & More|
- She was originally set to debut in the girl group 6mix.
- She officially changed her name from "Yoo Jeong-yeon" in third grade because she was teased for her birth name "Yoo Kyung-wan", which was considered too boyish.
- On her first try, she failed the JYP audition. She became a trainee after passing the JYP Entertainment’s 6th Open Audition on March 1, 2010.
- The leader of Twice was decided by anonymous voting. Jeongyeon was in 2nd place.
- The name Jeongyeon means 'virtuous' and 'beautiful' in Korean.
- Her sister is actress Gong Seongyeon and they hosted Inkigayo together, and their father is a chef.
- She is ambidextrous, but her left hand is dominant. She can throw and write with her right hand, while eating food with her left.
- She has 2 dogs: a white Pomeranian named Bbosongie and a poodle named Nanan.
- In Gallup Korea's annual music polls which interview 1,500 people between the ages 13–29, Jeongyeon was voted the 15th most popular idol in 2016, the 12th in 2017, and the 17th in 2018. Among Twice, alongside Nayeon and Tzuyu, she is one of the members who ranked in the top 20 idol list for three consecutive years.
- Jeongyeon admitted she nearly quit being a trainee because she wanted to work at a bakery; she even almost thought about making her own bakery.
- Her MBTI personality is ISFJ-T (Defender), same as Dahyun.
- Main article: Jeongyeon/Gallery
- (KR) Nate: '식스틴' JYP의 미래 짊어질 9인, 걸그룹 트와이스 탄생 (종합)
- Soompi: TWICE's Jeongyeon, Gong Seung Yeon, And Kim Min Suk Revealed As New MCs For "Inkigayo"
- Soompi: TWICE's Jeongyeon Thanks Fans After Her Last Day Of Hosting "Inkigayo"
- TWICE Fan's: Information about Jeongyeon's Health Status and Further Participation in TWICE Activity
- Channel Korea: SEVERAL FEMALE TRAINEES HAVE LEFT JYP ENTERTAINMENT, WHAT HAPPENED?
- Koreaboo: Here’s How Each TWICE Member Was Discovered, And Signed To JYP
- Soompi: Watch: Sisters Gong Seung Yeon And TWICE’s Jeongyeon Cheer On Their Chef Dad
- Twice Showtime
- Koreaboo: TWICE Has 10 Furry Little friends…This Is Who They Are
- Soompi: Koreans Choose Top 10 Artists And Top 20 Idols Of 2016
- Soompi: Koreans Choose Top Singers, Songs, And Idols Of 2017
- Soompi: Koreans Vote For Artists Who Shined The Most + Favorite Songs And Idols Of 2018
- Koreaboo: TWICE Jeongyeon Confessed She Wanted To Quit Being A Trainee To Become Something Completely Different
- Finding TWICE's MBTI EP.JEONGYEON