| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2018 | J3-League | 29 | 2566 | 0 | 0 | 0 | — |
| 2019 | J2-League | 16 | 1350 | 0 | 0 | 0 | — |
| 2020 | J3-League | 12 | 1080 | 0 | 0 | 0 | — |
| 2021 | K League 2 | 15 | 1350 | 0 | 0 | 0 | 7.02 |
| 2022 | K League 2 | 17 | 1459 | 0 | 0 | 0 | 7.14 |
| 2023 | K League 2 | 18 | 1613 | 0 | 0 | 0 | 7.03 |
| 2024 | K League 1 | 28 | 1994 | 0 | 0 | 0 | 6.7 |
| 2025 | K League 1 | 31 | 2701 | 0 | 0 | 0 | 6.05 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Cohort: 17 K League 1 goalkeepers, 2025, min. 450 minutes. Computed by ranking the full league corpus, not taken from any feed.
Figures computed from the GioScore season-stats database · as of 2026-09-02
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Ulsan HD | 7 | 3 | 2 | 2 | 0 | 0 | 1 | 0 |
 Pohang Steelers | 6 | 2 | 3 | 1 | 0 | 0 | 0 | 0 |
 Seoul | 5 | 0 | 2 | 3 | 0 | 0 | 0 | 0 |
 Jeonbuk Motors | 5 | 1 | 1 | 3 | 0 | 0 | 2 | 0 |
 Gangwon | 5 | 1 | 2 | 2 | 0 | 0 | 1 | 0 |
 Gimcheon Sangmu | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Gwangju | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Daejeon Citizen | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Ansan Greeners | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 Bucheon 1995 | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Jeonnam Dragons | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Anyang | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Jeju United | 2 | 0 | 0 | 2 | 0 | 0 | 1 | 0 |
 Giravanz Kitakyushu | 2 | 1 | 1 | 0 | 0 | 0 | 1 | 0 |
 Kataller Toyama | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Sagamihara | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Ryūkyū | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Kashiwa Reysol | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
 Omiya Ardija | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Ventforet Kofu | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
Player stats against each opponent national team
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Mexico U23 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
Jun-su Ahn featured 31 times in the 2025 K League 1 (2,701 minutes). Per-match rating over the season: 6.05. Set against the 17 K League 1 goalkeepers who played 450+ minutes in 2025, his standing by match rating is the 18th percentile.
His league record spans 8 seasons (2018–2025) across 6 clubs. At his best he averaged 7.14 in 2022, K League 2; at his worst, 6.05 in 2025. His last two rated seasons average 0.69 below his earlier career level.
