| 01 Mar 21 | r01   | Ulsan Hyundai FCUlsan Hyundai | 5 - 0 | Gangwon FCGangwon FC |
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| 06 Mar 21 | r02 | Gwangju FCGwangju FC | 0 - 1 | Ulsan Hyundai FCUlsan Hyundai |
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| 09 Mar 21 | r03 | Ulsan Hyundai FCUlsan Hyundai | 3 - 1 | Incheon United FCIncheon Unite |
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| 13 Mar 21 | r04 | Pohang SteelersPohang Steele | 1 - 1 | Ulsan Hyundai FCUlsan Hyundai |
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| 16 Mar 21 | r05 | Ulsan Hyundai FCUlsan Hyundai | 0 - 0 | Jeju United FCJeju United F |
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| 21 Mar 21 | r06 | Daegu FCDaegu FC | 2 - 1 | Ulsan Hyundai FCUlsan Hyundai |
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| 03 Apr 21 | r07 | Seongnam FCSeongnam FC | 0 - 1 | Ulsan Hyundai FCUlsan Hyundai |
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| 07 Apr 21 | r08 | Ulsan Hyundai FCUlsan Hyundai | 3 - 2 | FC SeoulFC Seoul |
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| 11 Apr 21 | r09 | Suwon FCSuwon FC | 0 - 1 | Ulsan Hyundai FCUlsan Hyundai |
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| 18 Apr 21 | r10 | Suwon Samsung BluewingsSuwon Samsung | 3 - 0 | Ulsan Hyundai FCUlsan Hyundai |
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| 21 Apr 21 | r11 | Ulsan Hyundai FCUlsan Hyundai | 0 - 0 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
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| 25 Apr 21 | r12 | Incheon United FCIncheon Unite | 0 - 0 | Ulsan Hyundai FCUlsan Hyundai |
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| 01 May 21 | r13 | Ulsan Hyundai FCUlsan Hyundai | 2 - 0 | Gwangju FCGwangju FC |
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| 12 May 21 | r15 | Gangwon FCGangwon FC | 2 - 2 | Ulsan Hyundai FCUlsan Hyundai |
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| 16 May 21 | r16 | Ulsan Hyundai FCUlsan Hyundai | 1 - 1 | Suwon Samsung BluewingsSuwon Samsung |
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| 19 May 21 | r17  | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 4 | Ulsan Hyundai FCUlsan Hyundai |
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| 22 May 21 | r18 | Ulsan Hyundai FCUlsan Hyundai | 1 - 0 | Pohang SteelersPohang Steele |
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| 29 May 21 | r19 | Jeju United FCJeju United F | 1 - 2 | Ulsan Hyundai FCUlsan Hyundai |
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| 20 Jun 21 | r14 | Ulsan Hyundai FCUlsan Hyundai | 2 - 2 | Seongnam FCSeongnam FC |
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| 25 Jul 21 | r21 | Ulsan Hyundai FCUlsan Hyundai | 2 - 5 | Suwon FCSuwon FC |
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| 31 Jul 21 | r22 | FC SeoulFC Seoul | 0 - 0 | Ulsan Hyundai FCUlsan Hyundai |
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| 04 Aug 21 | r20 | Ulsan Hyundai FCUlsan Hyundai | 2 - 1 | Daegu FCDaegu FC |
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| 07 Aug 21 | r23 | Ulsan Hyundai FCUlsan Hyundai | 2 - 1 | Gangwon FCGangwon FC |
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| 14 Aug 21 | r25 | Jeju United FCJeju United F | 2 - 2 | Ulsan Hyundai FCUlsan Hyundai |
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| 22 Aug 21 | r26 | Ulsan Hyundai FCUlsan Hyundai | 3 - 1 | Suwon Samsung BluewingsSuwon Samsung |
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| 25 Aug 21 | r27 | FC SeoulFC Seoul | 1 - 2 | Ulsan Hyundai FCUlsan Hyundai |
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| 29 Aug 21 | r28 | Ulsan Hyundai FCUlsan Hyundai | 3 - 2 | Incheon United FCIncheon Unite |
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| 10 Sep 21 | r29 | Ulsan Hyundai FCUlsan Hyundai | 0 - 0 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
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| 18 Sep 21 | r30 | Daegu FCDaegu FC | 2 - 1 | Ulsan Hyundai FCUlsan Hyundai |
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| 21 Sep 21 | r31 | Pohang SteelersPohang Steele | 1 - 2 | Ulsan Hyundai FCUlsan Hyundai |
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| 25 Sep 21 | r32 | Ulsan Hyundai FCUlsan Hyundai | 1 - 0 | Gwangju FCGwangju FC |
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| 02 Oct 21 | r33 | Suwon FCSuwon FC | 0 - 3 | Ulsan Hyundai FCUlsan Hyundai |
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| 24 Oct 21 | r24 | Seongnam FCSeongnam FC | 2 - 1 | Ulsan Hyundai FCUlsan Hyundai |
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| 31 Oct 21 | r01 | Ulsan Hyundai FCUlsan Hyundai | 3 - 2 | Suwon FCSuwon FC |
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| 06 Nov 21 | r02 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 3 - 2 | Ulsan Hyundai FCUlsan Hyundai |
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| 21 Nov 21 | r03 | Ulsan Hyundai FCUlsan Hyundai | 3 - 1 | Jeju United FCJeju United F |
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| 28 Nov 21 | r04 | Suwon Samsung BluewingsSuwon Samsung | 0 - 0 | Ulsan Hyundai FCUlsan Hyundai |
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| 05 Dec 21 | r05 | Ulsan Hyundai FCUlsan Hyundai | 2 - 0 | Daegu FCDaegu FC |
Team 2021 Schedules
Bucheon FC 1995
Daejeon Hana Citizen
FC Anyang
FC Seoul
Gangwon FC
Gimcheon Sangmu
Gwangju FC
Incheon United
Jeju SK
Jeonbuk Hyundai Motors
Pohang Steelers
Ulsan HD
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