The year he turned 18, he joined the T1 academy team, and he was called up to the first team that December.
In 2021, he made his LCK debut, beat Liiv Sandbox and was chosen team MVP. In his second match, he was named POG for the first time. That summer, he reached the LCK Summer final but lost to Damwon Kia.
In April 2022, he lifted his first trophy at the LCK Spring and was named finals MVP. At the MSI and Worlds, T1 lost to China’s RNG and to DRX, finishing second at both, but he was named Jungler of the Year at the year-end LCK Awards.
The breakthrough yearIn November 2023, the year he turned 21, T1 beat Weibo Gaming 3-0 in the final at the Gocheok Sky Dome in Seoul, and he won his first Worlds title.
In 2024, he won Worlds for a second straight year. It was the first time in the tournament’s history that the same roster had won twice in a row. In November, he signed a two-year extension with T1.
In September 2025, he was chosen for the All-LCK Second Team, and in November he won a third straight Worlds title. At the December LCK Awards he was named Jungler of the Year again, and on his birthday, the 24th, he extended with T1 through 2028.
In 2026, he finished fourth at the Esports World Cup in France. In August, he returned to the starting spot he had given up to a second-team jungler, but in September T1 lost the LCK playoff match to Hanwha Life that would have taken it to the final.
Oner (born Dec 24, 2002) debuted in the LCK with T1 on Feb 21, 2021, the year he turned 19, and became known on Nov 19, 2023, the year he turned 21, when he won his first Worlds title. In 2025, the year he turned 23, he won a third straight Worlds title.
Ages are by calendar year (the year minus the birth year), birthdays aside.
He joined the T1 academy team (Rookies) in 2020 and was called up to the first team that December, beginning his professional career in earnest.
Source 01 · OSEN (Korean) · Oner Moon Hyeon-jun extends with T1 through 2028 · opens in a new tab The article gives the call-up only to the month.He made his LCK debut after ten games on the first-team roster and beat Liiv Sandbox 2-0. On Graves and Nidalee, he got ahead of the opposing jungler in both games and was chosen team MVP by T1.
Source 02 · FOMOS (Korean) · T1 Oner Moon Hyeon-jun debuts against Liiv Sandbox · opens in a new tabSource 03 · Xportsnews (Korean) · Oner Moon Hyeon-jun is the team MVP against Liiv Sandbox · opens in a new tabSource 04 · Daily eSports (Korean) · Oner Moon Hyeon-jun wins his debut · opens in a new tabHe was named POG for the first time in his second LCK match.
Source 05 · Daily eSports (Korean) · Oner Moon Hyeon-jun wins his first POG · opens in a new tabIn the final held in Goyang, Gyeonggi Province, T1 lost 1-3 to Damwon Kia.
Source 06 · Maeil Business Newspaper (Korean) · Damwon Kia wins a third straight LCK title · opens in a new tabIn the final at KINTEX in Goyang, T1 beat Gen.G 3-1 for its tenth LCK title, and he was chosen finals MVP.
Source 07 · OSEN (Korean) · [T1 V10] Oner Moon Hyeon-jun named finals MVP · opens in a new tabIn the final at BEXCO in Busan, T1 lost 2-3 to China’s RNG.
Source 08 · Yonhap News Agency (Korean) · Korea’s T1 narrowly loses the MSI final · opens in a new tabIn the final, T1 lost to DRX in a close series that went to a fifth game.
Source 09 · ZDNet Korea (Korean) · DRX wins the 2022 Worlds · opens in a new tabHe won the jungler category of the by-position player awards.
Source 10 · Daily eSports (Korean) · [LCK Awards] Jungler of the Year Oner Moon Hyeon-jun · opens in a new tabIn the final at the Gocheok Sky Dome in Seoul, T1 beat Weibo Gaming 3-0. It was T1’s first Worlds title in seven years and his first.
T1 won the final at the O2 Arena in London for its fifth title. It was the first time in the tournament’s history that the same roster had won two years in a row.
Source 12 · Etoday (Korean) · The LoL transfer market’s “coming home” rush [Deep in the Game] · opens in a new tabT1 announced the re-signing in an official statement.
Source 13 · Korea Economic Daily (Korean) · “I’ll conquer the LCK too”: Oner re-signs with T1 for two years · opens in a new tabIn the list of 2025 regular-season award winners announced by the LCK, he was chosen as the jungler on the All-LCK Second Team.
Source 14 · Dailian (Korean) · Gen.G sweeps the 2025 All-LCK First Team · opens in a new tabIn the final in Chengdu, China, T1 beat KT Rolster 3-2 in games for a third straight Worlds title (a three-peat). It was T1’s sixth title overall.
Source 15 · Newsis (Korean) · Faker’s Worlds three-peat, a success on the second try; T1’s sixth title · opens in a new tabHe won the jungler category of the by-position player awards again.
Source 16 · Korea Economic Daily (Korean) · LCK Player of the Year BDD Kwak Bo-seong · opens in a new tabHe extended again with more than a year left on his contract, lengthening his time with T1 through 2028. It was announced on his birthday.
Source 01 · OSEN (Korean) · Oner Moon Hyeon-jun extends with T1 through 2028 · opens in a new tabIn the third-place match in Paris, France, T1 lost 1-2 to Gen.G and finished fourth.
Source 17 · JoongAng Ilbo (Korean) · T1’s Oner finishes fourth at the EWC · opens in a new tabIn the Aug. 8 match against Hanwha Life Esports, he had given up the starting spot to a second-team jungler, and he started again against Dplus Kia.
Source 18 · Etoday (Korean) · T1 with Oner back as a starter · opens in a new tabAt the KSPO Dome in Seoul, T1 lost 1-3 to Hanwha Life Esports in the match for a place in the final, ending its run.
Source 19 · STN News (Korean) · Hanwha Life beats T1 3-1 to reach the final · opens in a new tabEND OF SELECTED RECORDSSelected records, 2020–2026 · 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.
Games · South Korea
Dec 24, 2002 —
Ages are counted from the birth year 2002: the year of the event minus 2002, birthdays aside. “Key moment” labels and the connecting story are AgeTrail's editorial reading.
Fact-checked: 2026.09.29 · An independent archive, not affiliated with the person or their agency.