Field Insider
Player Finder

Most Improved defenders in K League 1 2026

The most improved defenders in K League 1 in 2026, ranked on Field Insider.

Most improved goalkeepers in K League 1Most improved midfielders in K League 1Most improved attackers in K League 1Best defenders in K League 1Most in-form defenders in K League 1Top-scoring defenders in K League 1

At a glance

Choi Woo-Jin of Jeonbuk Motors is the standout for raw talent across defenders in K League 1, with a Field Insider Rating of 46.5, and Kang Joon-Hyuck has been the form player this season, grading 29.2, and D. Bakker leads the scoring with 4 goals.

The numbers a scout watches are the year-on-year jumps: Song Jun-Seok has improved his Season rating most, up +18.8 on last season, while Lee Hyun-Yong's scouting Rating has risen fastest, +2.9 over the same span. Those are the players whose trajectory is bending upward fastest.

By our market-value index, Jin Si-Woo of Gwangju FC is the most valuable name in this group at 13.5.

Best talent
Choi Woo-Jin46.5RTG
Jeonbuk Motors
In form
Kang Joon-Hyuck29.2SsN
Gangwon FC
Rising potential
Lee Hyun-Yong+2.9RTG
Suwon City FC · 24/25→25/26
Most improved
Song Jun-Seok+18.8SsN
Gimcheon Sangmu FC · 24/25→25/26
Top scorer
D. Bakker4goals
FC Anyang
Most valuable
Jin Si-Woo13.5val
Gwangju FC
27 players · ranked by most improvedCustomise →
PlayerTeam
1Song Jun-SeokCentre-backGimcheon Sangmu FC25+18.8
24/25→25/26
266.5%458.5%
2Jo Seong-KwonCentre-backDaejeon Citizen25+17.1
24/25→25/26
209.4%425.7%
3Kim Young-BinFull-backJeonbuk Motors34+14.8
24/25→25/26
26153.9%1435.6%
4Kim Jin-SuCentre-backFC Seoul34+13.7
24/25→25/26
2331.6%136%
5Juan AntonioCentre-backFC Seoul30+12
24/25→25/26
2228.2%2625.5%
6M. TuciCentre-backGangwon FC27+11.4
24/25→25/26
2649.7%367.1%
7Kim Tae-HwanCentre-backJeonbuk Motors37+11.4
24/25→25/26
2020.9%88%
8Choi Woo-JinFull-backJeonbuk Motors22+10.3
24/25→25/26
2347
9Lee Hyun-YongCentre-backSuwon City FC22+6.8
24/25→25/26
10212.5%457%
10Eo Jeong-WonFull-backPohang Steelers27+6.6
24/25→25/26
173.5%360.8%
11Kim Moon-HwanFull-backDaejeon Citizen31+4.6
24/25→25/26
1338.7%20±0%
12Yazan Al ArabFull-backFC Seoul30+4.2
24/25→25/26
195%256.4%
13Yu In-SooCentre-backJeju United FC31+4.1
24/25→25/26
1765.7%2110%
14Lee Jae-IkCentre-backUlsan Hyundai FC27+3.7
24/25→25/26
10162.2%3716.4%
15Lee Zi-SolCentre-backSuwon City FC27+3.2
24/25→25/26
6123.1%3415%
16DerlanCentre-backSuwon City FC30+2.2
21/22→25/26
930.6%1964.7%
17Kim Kang-SanCentre-backDaegu FC27+0.5
24/25→25/26
124.3%3513.9%
18Park Chan-YongCentre-backPohang Steelers30-0.3
24/25→25/26
1315.9%256.5%
19Cho Hyun-TaekFull-backUlsan Hyundai FC25-0.9
24/25→25/26
827%4510.3%
20Kim Tae-HwanCentre-backGimcheon Sangmu FC26-1.2
24/25→25/26
16318.4%386.8%
21Lee Jung-TaekFull-backGimcheon Sangmu FC28-2.7
24/25→25/26
124%311%
22Park Cheol-WooFull-backGimcheon Sangmu FC28-6.8
24/25→25/26
1264.3%301.3%
23Lee YongFull-backSuwon City FC39-8.9
24/25→25/26
756%652.5%
24Choi JunFull-backFC Seoul27-13.1
24/25→25/26
2450.6%3815.9%
25J. CélestineFull-backJeju United FC29-14
23/24→25/26
19171.8%3061.2%
26D. BakkerCentre-backFC Anyang31-32.3
24/25→25/26
2259%405.7%
27Baek Dong-GyuCentre-backBucheon FC 199535-36.3
22/23→25/26
1275.8%1164.3%