People · Republic of Korea
JiHan Seo (서지한)
3×3 · top 2.8% of 284,439 all-time · competing since October 2023 · 2023SEOJ05
JiHan Seo (서지한) has been competing for 3 years. His best event is the 3×3: a personal-best single of 8.03, set at Hamoye Jinju 2026, puts him in the top 2.8% of the 284,439 people who have ever been ranked in the event, and 184th in Republic of Korea. Until July 2008, no official 3×3 solve in the world had been that fast. Across 10 competitions since October 2023, he has put 218 official solves on the record across five events. Solve to solve, his 3×3 times vary about 13% around a typical one; 56% of the 35,811 competitors with ten or more counted rounds hold a tighter spread. His 3×3 best has come down from 12.10 in October 2023 to 8.03, a 34% improvement. JiHan has entered ten competitions, more competitions than 92% 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 | 8.03 | 9.91 | top 2.8% | 184 / 4,352 | |
| 2×2 | 2.02 | 3.25 | top 4.9% | 132 / 2,319 | |
| 4×4 | 33.96 | 36.91 | top 5.8% | 127 / 1,308 | |
| 5×5 | 1:12.63 | 1:21.49 | top 13.5% | 141 / 716 | |
| 6×6 | 3:15.52 | 3:28.09 | top 48.3% | 196 / 329 |
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
- 16 May 2026Four personal bests in one day at Hamoye Jinju 2026.
- 6 Apr 2024First sub-10 3×3: 9.95 at Busan Spring 2024.
- 6 Apr 2024Five personal bests in one day at Busan Spring 2024.
- 3 Feb 2024Three personal bests in one day at Daegu Cold Winter 2024.
- 29 Oct 2023First competition: Suncheon Fall 2023. A 13.75 3×3 single to start from.
Competitions
- Hamoye Jinju 2026 · 16 May 2026 — 4 personal bests set
- Seoul Winter 2026 · 17 Jan 2026 — 2 personal bests set
- Daejeon Spring 2025 · 25 May 2025
- Happy Suseong 2025 · 18 Jan 2025 — 1 personal best set
- Seoul Winter 2024 · 14 Dec 2024 — 2 personal bests set
- Daegu Autumn 2024 · 26 Oct 2024 — 1 personal best set
- Busan Spring 2024 · 6 Apr 2024 — 5 personal bests set
- Daegu Cold Winter 2024 · 3 Feb 2024 — 3 personal bests set
- Korean Championship 2023 · 15 Dec 2023 — 1 personal best set
- Suncheon Fall 2023 · 29 Oct 2023 — 1 personal best set
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.
- Jerry Hwang (황동욱) — met in 45 rounds, finished ahead 4 times
- Seung Hyuk Nahm (남승혁) — met in 45 rounds, never finished ahead
- Ko Youngjin (고영진) — met in 44 rounds, finished ahead 17 times
Next targets
- A sub-8 3×3 single — 7,931 people have one; it is 0.03 away.
- A sub-2 2×2 single — 8,848 people have one; it is 0.02 away.
Targets move as he improves.