People · Republic of Korea
Seunghyun Ku (구승현)
3×3 · top 11.3% of 284,439 all-time · competing since July 2022 · 2022KUSE01
Seunghyun Ku (구승현) has been competing for 4 years. Her best event is the 3×3: a personal-best single of 11.25, set at Rubisian Ice Break Iasi 2025, puts her in the top 11.3% of the 284,439 people who have ever been ranked in the event, and 633rd in Republic of Korea. Across 15 competitions since July 2022, she has put 268 official solves on the record across ten events. Solve to solve, her 3×3 times vary about 14% around a typical one, an early reading from 6 counted rounds. Her 4×4 best has come down from 1:11.46 in July 2022 to 48.18, a 33% improvement. Seunghyun has entered 15 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 | 11.25 | 16.23 | top 11.3% | 633 / 4,352 | |
| 2×2 | 3.40 | 5.38 | top 19.0% | 572 / 2,319 | |
| 7×7 | 3:32.90 | 3:56.81 | top 20.8% | 77 / 254 | |
| 5×5 | 1:22.99 | 1:29.43 | top 21.5% | 201 / 716 | |
| 4×4 | 48.18 | 51.68 | top 22.3% | 397 / 1,308 | |
| 6×6 | 2:24.13 | 2:31.56 | top 22.7% | 101 / 329 | |
| Megaminx | 1:56.94 | 2:11.12 | top 44.1% | 278 / 524 | |
| Pyraminx | 9.14 | 17.25 | top 46.0% | 677 / 1,271 | |
| Clock | 17.79 | 19.24 | top 58.1% | 380 / 536 | |
| Skewb | 15.11 | 20.75 | top 78.6% | 713 / 854 |
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, 4×4. Faster is higher — the axis is the right way up.
The story so far
- 29 Nov 2025Three personal bests in one day at Rubisian Ice Break Iasi 2025.
- 18 Oct 2025First sub-15 3×3: 14.80 at Rubisian Autumn Open Iasi 2025.
- 18 Oct 2025Three personal bests in one day at Rubisian Autumn Open Iasi 2025.
- 23 Jul 2022First competition: Seoul Summer 2022.
Competitions
- Korea Open 2026 · 15 Aug 2026
- The Mall Lifestore Thapra Cubing 2026 · 27 Jun 2026 — 1 personal best set
- Hamoye Jinju 2026 · 16 May 2026 — 1 personal best set
- Rubisian Ice Break Iasi 2025 · 29 Nov 2025 — 3 personal bests set
- Bucharest Cubing November 2025 · 15 Nov 2025 — 2 personal bests set
- Rubisian Autumn Open Iasi 2025 · 18 Oct 2025 — 3 personal bests set
- Marginea Cubing 2025 · 4 Oct 2025 — 1 personal best set
- Please Big Cubes Korea 2025 · 10 May 2025 — 2 personal bests set
- Anyang Haseyo 2025 · 8 Feb 2025 — 2 personal bests set
- Seoul Winter 2024 · 14 Dec 2024
- Daegu Autumn 2024 · 26 Oct 2024 — 1 personal best set
- Korean Championship 2023 · 15 Dec 2023 — 1 personal best set
- Rubik's WCA World Championship 2023 · 12 Aug 2023 — 1 personal best set
- Daegu Hot Spring 2023 · 15 Apr 2023 — 2 personal bests set
- Seoul Summer 2022 · 23 Jul 2022
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 her.
- Ko Youngjin (고영진) — met in 34 rounds, finished ahead 6 times
- Seung Hyuk Nahm (남승혁) — met in 34 rounds, never finished ahead
- Jerry Hwang (황동욱) — met in 34 rounds, never finished ahead
Next targets
- A sub-10 3×3 single — 21,172 people have one; it is 1.25 away.
- A sub-3 2×2 single — 26,570 people have one; it is 0.40 away.
Targets move as she improves.