| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2017 | J1 League | 33 | 2907 | 0 | 0 | 0 | 6.83 |
| 2018 | J1 League | 34 | 3060 | 0 | 0 | 0 | 7.12 |
| 2019 | J1 League | 33 | 2970 | 0 | 0 | 0 | 6.93 |
| 2020 | K League 1 | 17 | 1530 | 0 | 2 | 0.12 | 6.97 |
| 2020 | J1 League | 1 | 90 | 0 | 0 | 0 | 5.71 |
| 2021 | K League 2 | 18 | 1620 | 0 | 1 | 0.06 | 7.29 |
| 2022 | K League 1 | 15 | 1349 | 0 | 0 | 0 | 7.23 |
| 2023 | J1 League | 16 | 1440 | 0 | 0 | 0 | 6.87 |
| 2024 | J1 League | 32 | 2756 | 0 | 0 | 0 | 6.82 |
| 2025 | J1 League | 2 | 180 | 0 | 0 | 0 | 6.17 |
| 2025 | K League 2 | 18 | 1620 | 0 | 0 | 0 | 6.5 |
| 2026 | K League 1 | 22 | 1980 | 0 | 0 | 0 | 6.68 |
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.
Figures computed from the GioScore season-stats database · as of 2026-08-15
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Vissel Kobe | 7 | 1 | 1 | 5 | 0 | 0 | 0 | 0 |
 Busan I'Park | 4 | 4 | 0 | 0 | 0 | 1 | 1 | 0 |
 Seongnam | 4 | 2 | 0 | 2 | 0 | 0 | 0 | 0 |
 Cerezo Osaka | 4 | 1 | 1 | 2 | 0 | 0 | 0 | 0 |
 Gamba Osaka | 4 | 1 | 2 | 1 | 0 | 0 | 0 | 0 |
 Sagan Tosu | 3 | 2 | 0 | 1 | 0 | 0 | 1 | 1 |
 Suwon Bluewings | 3 | 1 | 0 | 2 | 0 | 0 | 1 | 0 |
 Albirex Niigata | 3 | 1 | 0 | 2 | 0 | 0 | 1 | 0 |
 Kawasaki Frontale | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 |
 Incheon United | 3 | 1 | 2 | 0 | 0 | 0 | 0 | 0 |
 Kamatamare Sanuki | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 |
 Zweigen Kanazawa | 3 | 1 | 2 | 0 | 0 | 0 | 0 | 0 |
 Urawa Reds | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Shonan Bellmare | 2 | 2 | 0 | 0 | 0 | 0 | 1 | 0 |
 Consadole Sapporo | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Yokohama F. Marinos | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 FC Tokyo | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Jeonbuk Motors | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Kashima Antlers | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Bucheon 1995 | 2 | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
Player stats against each opponent national team
Across the 2026 K League 1, Sung-Yun Gu totalled 22 appearances (1,980 minutes). That season graded out at an average match rating of 6.68.
No season rated higher than 2021 (7.29, K League 2); none lower than 2025 (6.5). His two latest rated seasons run 0.42 lower than the rest of his career.
