The breakthrough yearIn January 2019, the year he turned 20, he was revealed as the first member of Tomorrow X Together. The group debuted in March and won a music show one week later. In October it released its first studio album, and in December it won best new artist at the MAMA.
In 2020, the group released its third mini album, Minisode 1: Blue Hour. In 2021, its second studio album, The Chaos Chapter: Freeze, reached No. 5 on the Billboard 200.
In 2022, its fourth mini album became its first million-seller, and it became the first K-pop group to perform at Lollapalooza. In February 2023, the group reached No. 1 on the Billboard 200.
In September 2024, he began his first solo activity with the mixtape GGUM, and in October he won a music show.
In 2025, he re-signed with Big Hit Music. In November he released his first solo album, No Labels: Part 01, six years and eight months after debut, and it sold 601,105 copies in the first week.
In April 2026, the group’s first album since re-signing reached No. 3 on the Billboard 200, and in July his second solo album, No Labels: Part 02, reached No. 16. His appearance at the Z100 Summer Bash, a first for a Korean singer, was announced, and on his birthday in September he donated 100 million won.
Yeonjun (born Sep 13, 1999) became known on Jan 11, 2019, the year he turned 20, when he was revealed as the first member of Tomorrow X Together, and debuted with the same group on Mar 4, 2019. His first solo activity was the mixtape GGUM on Sep 19, 2024, the year he turned 25.
Ages are by calendar year (the year minus the birth year), birthdays aside.
02 / QUICK ANSWERS
Q & AFrequently asked
- How old was Yeonjun when he debuted?
- On Mar 4, 2019, the year he turned 20, Tomorrow X Together released its debut album The Dream Chapter: Star. One week later, the group won first place on a music show.
- How old was Yeonjun when he became famous?
- In January 2019, the year he turned 20, he was revealed as the first member of Tomorrow X Together. OSEN reports that he drew attention from Korean and international media before his official debut, and that the introduction film passed 10 million views in three days.
- How old was Yeonjun when he started his solo career?
- On Sep 19, 2024, the year he turned 25, he released the mixtape GGUM, his first solo activity since debut. His first solo album, No Labels: Part 01, came out on Nov 7, 2025, the year he turned 26, six years and eight months after debut.
- Have Yeonjun’s solo albums reached the Billboard 200?
- His first solo album entered the Billboard 200 for two straight weeks, including the chart announced on Nov 25, 2025, and his second album ranked No. 16 on the chart announced on Jul 21, 2026 (local time).
- How old is Yeonjun?
- Born in 1999, he turns 27 in 2026 (27 as of Sep 30, 2026).