People · Republic of Korea
Hajun Sung (성하준)
3×3 · top 10.8% of 284,439 all-time · competing since July 2024 · 2024SUNG06
Hajun Sung (성하준) has been competing for 2 years. His best event is the 3×3: a personal-best single of 11.09, set at Korea Open 2025, puts him in the top 10.8% of the 284,439 people who have ever been ranked in the event, and 610th in Republic of Korea. Across 14 competitions since July 2024, he has put 213 official solves on the record across nine events. Solve to solve, his 3×3 times vary about 12% around a typical one, steadier than 68% of the 35,811 competitors with ten or more counted rounds. His 3×3 best has come down from 24.65 in July 2024 to 11.09, a 55% improvement. Hajun has entered 14 competitions, more competitions than 95% of everyone who has ever competed.
Standing, event by event
vs everyone ever ranked| Event | PB single | PB average | All-time standing | Republic of Korea | |
|---|---|---|---|---|---|
| 3×3 | 11.09 | 13.75 | top 10.8% | 610 / 4,352 | |
| 2×2 | 3.46 | 4.77 | top 19.7% | 591 / 2,319 | |
| Pyraminx | 6.79 | 8.92 | top 26.1% | 397 / 1,271 | |
| 4×4 | 53.07 | 1:00.27 | top 28.4% | 505 / 1,308 | |
| Megaminx | 1:41.87 | 1:53.11 | top 35.7% | 231 / 524 | |
| Clock | 16.59 | 19.65 | top 54.0% | 361 / 536 | |
| Skewb | 10.37 | 14.91 | top 57.2% | 536 / 854 | |
| 5×5 | 2:23.44 | 2:32.37 | top 62.7% | 504 / 716 | |
| 3×3 one-handed | 41.58 | 49.86 | top 67.5% | 758 / 966 |
Percentile against all competitors ever ranked in each event, a fairer measure than raw rank, because the pools differ by a factor of ten.
The line so far
Best single per competition, 3×3. Faster is higher — the axis is the right way up.
The story so far
- 15 Aug 2025Four personal bests in one day at Korea Open 2025.
- 16 Feb 2025First sub-15 3×3: 11.49 at Tokyo Open AM Winter 2025.
- 18 Jan 2025Four personal bests in one day at Happy Suseong 2025.
- 5 Oct 2024First sub-20 3×3: 18.32 at GAN Mongolian Open 2024.
- 7 Jul 2024First competition: Katano Milky Way 2024. A 24.65 3×3 single to start from.
Competitions
- Korea Open 2026 · 15 Aug 2026 — 1 personal best set
- Kanto Winter 2026 · 21 Feb 2026
- Seoul Winter 2026 · 17 Jan 2026
- Korea Open 2025 · 15 Aug 2025 — 4 personal bests set
- Suwon Summer 2025 · 13 Jul 2025
- Osan Summer 2025 · 29 Jun 2025 — 1 personal best set
- NxN in Hanoi 2025 · 26 Apr 2025 — 2 personal bests set
- Please Minx Korea 2025 · 5 Apr 2025 — 1 personal best set
- Korea Newcomers AM 2025 · 8 Mar 2025
- Tokyo Open AM Winter 2025 · 16 Feb 2025 — 1 personal best set
- Happy Suseong 2025 · 18 Jan 2025 — 4 personal bests set
- Daegu Autumn 2024 · 26 Oct 2024 — 2 personal bests set
- GAN Mongolian Open 2024 · 5 Oct 2024 — 2 personal bests set
- Katano Milky Way 2024 · 7 Jul 2024
Reading this page: a single is one solve's time · an average is the middle three of five solves, best and worst discarded · a PB is a personal best · a DNF (did not finish) is an attempt with no valid result: a popped piece, an unsolved face, an over-limit memorisation · top X% compares against everyone ever ranked in that event, which is fairer than raw rank because event pools differ tenfold.
The circuit
The people whose scorecards keep turning up next to his.
- Minjun Kim (김민준) — met in 36 rounds, never finished ahead
- Choi Goho (최고호) — met in 33 rounds, finished ahead 6 times
- Ko Youngjin (고영진) — met in 33 rounds, never finished ahead
Next targets
- A sub-10 3×3 single — 21,172 people have one; it is 1.09 away.
- A sub-3 2×2 single — 26,570 people have one; it is 0.46 away.
Targets move as he improves.