Domestic-league season · Kyoto Sanga.
Earlier this season at FC Seoul — AFC Champions League Elite: 4 apps, 0g 0a, 360 min
The headline Season rating covers his time at Kyoto Sanga; availability counts only fixtures while in this squad.
| Competition | Apps | G | A | Min | Match |
|---|---|---|---|---|---|
 AFC Champions League Eliteat FC Seoul | 4 | 0 | 0 | 360 | 6.58 |
 J1 League | 2 | 0 | 0 | 180 | 6.55 |
 J-League Cup | 1 | 0 | 0 | 90 | — |
Sung-Yun's current-season form is down 65% on last season (Season 23→8), while his Rating eased 31→16. His peak season for form remains 2024/25 (Season 23).
| Season | Club | Apps | G | A | Match | RTG | Season |
|---|---|---|---|---|---|---|---|
| 2025/26 | Kyoto Sanga · 3rd | 2 | 0 | 0 | 6.55 | 16 | 8 |
| 2024/25 | Kyoto Sanga · 14th | 32 | 0 | 0 | 6.73 | 31 | 23 |
| 2023/24 | Kyoto Sanga · 13th | 16 | 0 | 0 | 6.24 | 30 | 6 |
| 2022/23 | Gimcheon Sangmu FC · 3rd | 15 | 0 | 0 | 7.16 | 32 | 5 |
| 2020/21 | Daegu FC · 5th | 17 | 0 | 2 | 6.85 | 41 | 12 |
Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year.
Gu Sung-Yun is a 32-year-old goalkeeper at Kyoto Sanga, rated 15.5 overall by Field Insider's model. A seasoned veteran, he has been a fringe squad member this season (10.5% of available minutes). Below: strengths, watch-points, market-value outlook and the latest transfer news on Sung-Yun.
On the season, Sung-Yun graded 8 for current form (age-blind), on 1 clean sheet across 2 appearances.
Year-on-year, that's a drop on last season (Season 23 → 8). Over the 5 seasons on record his form has drifted down, peaking in 2024/25.
On long-term talent our Rating reads 16. At 32 Sung-Yun is into the veteran stage, where the age curve weighs on the projection, and a market index of 2.8 reflects that trajectory.
A career still climbing — Sung-Yun is at his peak right now, and the curve hasn't flattened.
1 clean sheet in 2 appearances (50% of games). Playing behind an upper-table side (3rd of 20) means a more protected goal, so the read is about command and distribution as much as raw shut-outs.
Rated 15.5 overall — below regular-starter level. A limited game time keeper carrying the gloves this season. Veteran phase — a short-term, lower-fee proposition as both level and value decline (0.8× and falling).
Generated from Field Insider's rating model · AI-written analysis to follow.
The gold line is market value — an index (not €) blending rating, age and league. It climbs through the early 20s, peaks around ages 23–27 (~7), then tapers with age. At 32, Sung-Yun sits on 2.8, past its peak and easing. The blue line is Sung-Yun's projected Rating — 15.5 today — recomputed at each age, so it follows the same rise-and-fall as a career matures and declines. Solid = up to today; dashed = projected.
No transfer news found for this player.
