Gu Sung-Yun

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).

Domestic career

Season	Club	Apps	CS	CS%	Match	RTG	Season
2026/27	FC Seoul	18	0	0%	6.76	—	—
2025/26	FC Seoul	4	0	0%	6.58	—	—
2025/26	Kyoto Sanga · 3rd	2	1	50%	6.55	16	8
2024/25	Kyoto Sanga · 14th	32	9	28%	6.73	31	23
2023/24	Kyoto Sanga · 13th	16	3	19%	6.24	30	6
2023/24	Consadole Sapporo	8	0	0%	6.24	—	—
2022/23	Gimcheon Sangmu FC · 3rd	15	3	20%	7.16	32	5

Domestic-league totals per season. RTG = Field Insider Rating (potential / ceiling); Season = age-blind form that year. 7 earlier seasons in the full career.

Korea Republic · international

Side	Apps	G
Korea Republic U23	4	0
South Korea	4	0

Career caps & goals — tournament breakdown in the full career.

Scout report

Experienced headGoalkeeper

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 1.7 reflects that trajectory.

From the career report

Read the full career report →

A career still climbing — Sung-Yun is at his peak right now, and the curve hasn't flattened.

Peak: 2024/25Trending upBreakout: 2024/25

15.5

Ratingi

below regular-starter level

8.4

Seasoni

below regular-starter level

10.5%

Minutes

limited game time

Def. actions / 90

light defensive volume

Output in context · Kyoto Sanga finished 3rd of 20 · an upper-table side

Apps

Clean sheets

50%

CS rate

10.5%

Minutes

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.

Watch points

Game time. Only 10.5% of available minutes — needs a settled run to prove the level.
Age curve. At 32, both level and resale value are on the downslope.
Level. Rates below a nailed-on top-tier starter on our model.

Outlook

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.

Per 90 & availability

Minutes played %10.5%

Available fixtures4 of 38

Goals / 900

Assists / 900

Goal contribution / 900

Defensive actions / 900

Player flow

Goal involvements0

Cards / 900

Season-by-season progression

Rating (potential)Season (form)

Value & potential by age

Market valueRating

Solid = now · dashed = projected

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 (~4), then tapers with age. At 32, Sung-Yun sits on 1.7, 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.