In May 2015, the year she turned 19, she took part in Mnet’s Sixteen as a trainee, and in October she debuted with the group TWICE.
The breakthrough yearIn April 2016, the year she turned 20, “Cheer Up” from the second mini album Page Two set off a “sha sha sha” craze, six months after her debut. In November, “TT” won first place on The Show for the first time, on Jeongyeon’s birthday.
In 2017, TWICE entered Billboard’s Heatseekers Albums chart for the first time with Signal, and in July the group made its official debut in Japan. In October, “Likey” from the first full-length album reached No. 1 on six music charts. In 2018, the group came back twice, with What Is Love? and Yes or Yes.
In April 2019, “Fancy” passed 150,000 first-week copies, a first for a girl group, and in May the group played a world tour show at the Olympic Gymnastics Arena. In June 2020, More & More first entered the Billboard 200. In October, her agency announced that she would sit out schedules, including promotions for the second full-length album, for the time being for health reasons.
In June 2021, she returned with Taste of Love, but in August she again stopped attending schedules for health reasons. In February 2022, she rejoined the U.S. concerts, resuming official activities. In July, all members re-signed with JYP.
In 2023, TWICE became the first women’s group to play SoFi Stadium in the U.S. In 2024, the group played Nissan Stadium in Japan, a first for a K-pop female artist.
The year she turned 29, in July, “Takedown,” sung with Jihyo and Chaeyoung, entered the U.S. Billboard Hot 100 at No. 86 for the first time, and in August she performed it live for the first time at Lollapalooza Chicago. In April 2026, she played National Stadium in Tokyo with a solo stage and a unit stage. In August she left JYP and signed with Baro Entertainment, and on Oct. 1 her casting in New Recruit: The Movie was announced.
Jeongyeon (birth name Yoo Jeong-yeon, born Nov 1, 1996) debuted with the group TWICE on Oct 20, 2015, the year she turned 19, and became widely known on Apr 25, 2016, the year she turned 20, when “Cheer Up” set off a “sha sha sha” craze. In 2025, the year she turned 29, “Takedown” from KPop Demon Hunters entered the U.S. Billboard Hot 100.
Ages are by calendar year (the year minus the birth year), birthdays aside.
The first episode of Sixteen, a debut project to choose the members of JYP Entertainment’s new girl group TWICE, aired. She took part as a trainee.
Source 03 · Ajunews (Korean) · Sixteen, episode 1 · opens in a new tabSource 01 · WikiTree (Korean) · TWICE member profiles · opens in a new tabHeld a debut showcase at AX Hall in Gwangjin District, Seoul, and performed “Like Ooh-Ahh,” the title track of the debut album The Story Begins. In the group, she took the sub vocalist role.
Source 02 · Korea Economic Daily (Korean) · TWICE debuts · opens in a new tabSource 01 · WikiTree (Korean) · TWICE member profiles · opens in a new tabThe title track “Cheer Up” from the second mini album Page Two set off a so-called “sha sha sha” craze, six months after her debut.
Won first place on SBS MTV’s The Show for the first time since debut. It was Jeongyeon’s birthday.
Source 06 · BizEnter (Korean) · “TT” wins on The Show · opens in a new tabTWICE entered the U.S. Billboard Heatseekers Albums chart for the first time.
Source 07 · Segye Ilbo (Korean) · Signal on Heatseekers · opens in a new tab Billboard’s announcement was on May 24 (local time); the album’s release date was not confirmed in news reports.Held the debut showcase Touchdown in Japan at Tokyo Metropolitan Gymnasium for about 15,000 people. The Japanese debut album #TWICE was No. 1 on the Oricon chart.
Source 08 · Star News (Korean) · Japanese debut showcase · opens in a new tabSource 09 · Yonhap News Agency (Korean) · Japanese debut album tops Oricon · opens in a new tab“Likey,” the title track of the first full-length album Twicetagram, was No. 1 on six music charts, including Genie, Naver and Bugs, on the afternoon of the 31st.
Source 10 · Yonhap News Agency (Korean) · “Likey” tops six charts · opens in a new tabHeld a showcase at Yes24 Live Hall in Seoul. It was a comeback after four months.
Source 11 · Sports Q (Korean) · Comeback with What Is Love? · opens in a new tabHeld a showcase at KBS Arena Hall. It was their first mini album in about seven months, since What Is Love?
Source 12 · Herald Business (Korean) · Comeback with Yes or Yes · opens in a new tabReleased the seventh mini album Fancy You. By Hanteo Chart it sold more than 150,000 copies in its first week, a first for a girl group.
Source 13 · Top Star News (Korean) · “Fancy” sells 150,000 in its first week · opens in a new tabPlayed a world tour show at the Olympic Gymnastics Arena (KSPO Dome) in Seoul. It was the group’s first show at the arena since debut.
Source 14 · Maeil Business (Korean) · Twicelights in Seoul · opens in a new tabThe ninth mini album More & More entered the U.S. Billboard 200 at No. 200, the first time the group’s name appeared on a Billboard main chart since debut.
Source 15 · Seoul Economic Daily (Korean) · “More & More” on the Billboard 200 · opens in a new tabHer agency, JYP Entertainment, announced on its official social media account that she would sit out all schedules, including promotions for the second full-length album, for the time being for health reasons.
Source 16 · YTN (Korean) · Jeongyeon sits out second full-length album promotions · opens in a new tabTWICE previewed the title track “Alcohol-Free” on the 9th, ahead of the new album Taste of Love on the 11th. Jeongyeon, who had missed the previous album’s promotions for health reasons, rejoined for the full-group promotions.
Source 18 · OSEN (Korean) · Jeongyeon returns · opens in a new tabSource 19 · Sports Kyunghyang (Korean) · “Alcohol-Free” preview release · opens in a new tabHer agency said she would not attend upcoming schedules for the time being for health reasons. It was her second break in activities, after the previous October.
Source 17 · Edaily (Korean) · Full text of the statement on Jeongyeon’s break · opens in a new tabJeongyeon, who had missed the Seoul concert in December 2021 for health reasons, rejoined TWICE’s U.S. concerts and resumed official activities.
Source 20 · MyDaily (Korean) · Jeongyeon joins the U.S. concerts · opens in a new tabSource 21 · Sports Chosun (Korean) · Jeongyeon’s latest · opens in a new tab The exact date of the show she rejoined was not confirmed. The U.S. concerts began on Feb. 15.JYP Entertainment announced that it had finished re-signing all TWICE members.
Source 22 · Star News (Korean) · All members re-sign · opens in a new tabIt was the first comeback of the year with all members. Pre-orders passed 1 million two days before release, the group’s highest.
Source 23 · Newsis (Korean) · Between 1&2 · opens in a new tabTWICE became the first women’s group to play SoFi Stadium in the U.S., with an audience of 50,000.
Source 24 · Star Today (Korean) · SoFi Stadium · opens in a new tab The article is dated June 12; the date of the show was not confirmed in news reports.Held the concert Ready to Be in Japan Special at Nissan Stadium in Japan. It was a first for a K-pop female artist, and the show on the 28th ended the world tour.
Source 25 · Yonhap News Agency (Korean) · Nissan Stadium · opens in a new tabSung with Jihyo and Chaeyoung for the soundtrack of Netflix’s animated film KPop Demon Hunters, “Takedown” entered the U.S. Billboard Hot 100 for the first time at No. 86 on the chart released on the 15th (local time).
Source 27 · KBS (Korean) · “Takedown” on the Hot 100 · opens in a new tabSource 28 · Maxmovie (Korean) · KPop Demon Hunters and TWICE · opens in a new tabTWICE headlined Lollapalooza Chicago as the first K-pop girl group to do so. Jeongyeon, Jihyo and Chaeyoung performed “Takedown” live for the first time.
Source 26 · Newsis (Korean) · Lollapalooza Chicago · opens in a new tabHer agency said she would skip the Oct. 4 world tour show in Bulacan for health reasons.
Source 29 · MBC Entertainment (Korean) · Jeongyeon sits out the Philippines show · opens in a new tabOn the world tour This Is For, played National Stadium in Tokyo as the first foreign artist to do so. Performed her solo stage “Fix a Drink” and the unit stage “Takedown” with Jihyo and Chaeyoung.
Source 30 · Newsis (Korean) · National Stadium show · opens in a new tabLeft JYP Entertainment after 11 years and signed an exclusive contract with Baro Entertainment, where her older sister, the actress Gong Seung-yeon, is signed. TWICE activities continue.
Source 31 · Xportsnews (Korean) · Chaeyoung leaves JYP · opens in a new tabSource 32 · Newspim (Korean) · Jeongyeon leaves JYP · opens in a new tabDistributor KT Studio Genie announced that she is cast in the film New Recruit: The Movie, subtitled A Ghost Lives in the Army Hospital. She plays a nurse officer.
Source 33 · Dispatch (Korean) · Jeongyeon cast in a film · opens in a new tabEND OF SELECTED RECORDSSelected records, 2015–2026 · not a complete list of work. “Key moment” is an editorial label, not a measure of success.
What did they do, and at what age?
AgeTrail lines up the key moments of a life by age.
Debut and breakthrough are marked separately, and every record has a source.
Music · South Korea
Nov 1, 1996 —
Ages are counted from the birth year 1996: the year of the event minus 1996, birthdays aside. “Key moment” labels and the connecting story are AgeTrail's editorial reading.
Fact-checked: 2026.10.03 · An independent archive, not affiliated with the person or their agency.