| 27 Feb 21 | r01   | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 0 | FC SeoulFC Seoul |
| 27 Feb 21 | r01 | Daegu FCDaegu FC | 1 - 1 | Suwon FCSuwon FC |
| 28 Feb 21 | r01 | Pohang SteelersPohang Steele | 2 - 1 | Incheon United FCIncheon Unite |
| 28 Feb 21 | r01 | Suwon Samsung BluewingsSuwon Samsung | 1 - 0 | Gwangju FCGwangju FC |
| 01 Mar 21 | r01 | Ulsan Hyundai FCUlsan Hyundai | 5 - 0 | Gangwon FCGangwon FC |
| 01 Mar 21 | r01 | Seongnam FCSeongnam FC | 0 - 0 | Jeju United FCJeju United F |
| |
| 06 Mar 21 | r02 | Jeju United FCJeju United F | 1 - 1 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 06 Mar 21 | r02 | Gwangju FCGwangju FC | 0 - 1 | Ulsan Hyundai FCUlsan Hyundai |
| 06 Mar 21 | r02 | Incheon United FCIncheon Unite | 2 - 1 | Daegu FCDaegu FC |
| 06 Mar 21 | r02 | Gangwon FCGangwon FC | 1 - 3 | Pohang SteelersPohang Steele |
| 07 Mar 21 | r02 | Suwon Samsung BluewingsSuwon Samsung | 1 - 0 | Seongnam FCSeongnam FC |
| 07 Mar 21 | r02 | FC SeoulFC Seoul | 3 - 0 | Suwon FCSuwon FC |
| |
| 09 Mar 21 | r03 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 1 | Gangwon FCGangwon FC |
| 09 Mar 21 | r03 | Ulsan Hyundai FCUlsan Hyundai | 3 - 1 | Incheon United FCIncheon Unite |
| 09 Mar 21 | r03 | Jeju United FCJeju United F | 1 - 0 | Pohang SteelersPohang Steele |
| 10 Mar 21 | r03 | Daegu FCDaegu FC | 1 - 4 | Gwangju FCGwangju FC |
| 10 Mar 21 | r03 | Seongnam FCSeongnam FC | 1 - 0 | FC SeoulFC Seoul |
| 10 Mar 21 | r03 | Suwon FCSuwon FC | 0 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 13 Mar 21 | r04 | Daegu FCDaegu FC | 1 - 1 | Jeju United FCJeju United F |
| 13 Mar 21 | r04 | Gwangju FCGwangju FC | 0 - 2 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 13 Mar 21 | r04 | Pohang SteelersPohang Steele | 1 - 1 | Ulsan Hyundai FCUlsan Hyundai |
| 13 Mar 21 | r04 | Incheon United FCIncheon Unite | 0 - 1 | FC SeoulFC Seoul |
| 14 Mar 21 | r04 | Suwon FCSuwon FC | 1 - 2 | Seongnam FCSeongnam FC |
| 14 Mar 21 | r04 | Suwon Samsung BluewingsSuwon Samsung | 1 - 1 | Gangwon FCGangwon FC |
| |
| 16 Mar 21 | r05 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 3 - 2 | Daegu FCDaegu FC |
| 16 Mar 21 | r05 | Ulsan Hyundai FCUlsan Hyundai | 0 - 0 | Jeju United FCJeju United F |
| 17 Mar 21 | r05 | Pohang SteelersPohang Steele | 0 - 3 | Suwon Samsung BluewingsSuwon Samsung |
| 17 Mar 21 | r05 | Gangwon FCGangwon FC | 0 - 0 | Seongnam FCSeongnam FC |
| 17 Mar 21 | r05 | FC SeoulFC Seoul | 2 - 1 | Gwangju FCGwangju FC |
| 17 Mar 21 | r05 | Incheon United FCIncheon Unite | 4 - 1 | Suwon FCSuwon FC |
| |
| 20 Mar 21 | r06 | Jeju United FCJeju United F | 1 - 1 | Gwangju FCGwangju FC |
| 20 Mar 21 | r06 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 1 - 1 | Suwon FCSuwon FC |
| 21 Mar 21 | r06 | Gangwon FCGangwon FC | 2 - 0 | Incheon United FCIncheon Unite |
| 21 Mar 21 | r06 | Seongnam FCSeongnam FC | 2 - 1 | Pohang SteelersPohang Steele |
| 21 Mar 21 | r06 | Suwon Samsung BluewingsSuwon Samsung | 1 - 2 | FC SeoulFC Seoul |
| 21 Mar 21 | r06 | Daegu FCDaegu FC | 2 - 1 | Ulsan Hyundai FCUlsan Hyundai |
| |
| 02 Apr 21 | r07 | Pohang SteelersPohang Steele | 0 - 0 | Daegu FCDaegu FC |
| 03 Apr 21 | r07 | Suwon Samsung BluewingsSuwon Samsung | 1 - 3 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 03 Apr 21 | r07 | Seongnam FCSeongnam FC | 0 - 1 | Ulsan Hyundai FCUlsan Hyundai |
| 03 Apr 21 | r07 | FC SeoulFC Seoul | 0 - 1 | Gangwon FCGangwon FC |
| 04 Apr 21 | r07 | Suwon FCSuwon FC | 2 - 1 | Jeju United FCJeju United F |
| 04 Apr 21 | r07 | Gwangju FCGwangju FC | 2 - 1 | Incheon United FCIncheon Unite |
| |
| 06 Apr 21 | r08  | Pohang SteelersPohang Steele | 1 - 3 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 06 Apr 21 | r08 | Daegu FCDaegu FC | 0 - 0 | Seongnam FCSeongnam FC |
| 07 Apr 21 | r08 | Ulsan Hyundai FCUlsan Hyundai | 3 - 2 | FC SeoulFC Seoul |
| 07 Apr 21 | r08 | Gwangju FCGwangju FC | 2 - 0 | Suwon FCSuwon FC |
| 07 Apr 21 | r08 | Incheon United FCIncheon Unite | 0 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| 07 Apr 21 | r08 | Jeju United FCJeju United F | 1 - 1 | Gangwon FCGangwon FC |
| |
| 10 Apr 21 | r09 | Gangwon FCGangwon FC | 3 - 0 | Daegu FCDaegu FC |
| 10 Apr 21 | r09 | FC SeoulFC Seoul | 1 - 2 | Pohang SteelersPohang Steele |
| 10 Apr 21 | r09 | Seongnam FCSeongnam FC | 2 - 0 | Gwangju FCGwangju FC |
| 11 Apr 21 | r09 | Jeju United FCJeju United F | 2 - 1 | Suwon Samsung BluewingsSuwon Samsung |
| 11 Apr 21 | r09 | Suwon FCSuwon FC | 0 - 1 | Ulsan Hyundai FCUlsan Hyundai |
| 11 Apr 21 | r09 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 5 - 0 | Incheon United FCIncheon Unite |
| |
| 17 Apr 21 | r10 | Suwon FCSuwon FC | 2 - 1 | Gangwon FCGangwon FC |
| 17 Apr 21 | r10 | Incheon United FCIncheon Unite | 0 - 3 | Jeju United FCJeju United F |
| 17 Apr 21 | r10 | FC SeoulFC Seoul | 0 - 1 | Daegu FCDaegu FC |
| 17 Apr 21 | r10 | Gwangju FCGwangju FC | 0 - 1 | Pohang SteelersPohang Steele |
| 18 Apr 21 | r10 | Suwon Samsung BluewingsSuwon Samsung | 3 - 0 | Ulsan Hyundai FCUlsan Hyundai |
| 18 Apr 21 | r10 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 1 - 0 | Seongnam FCSeongnam FC |
| |
| 20 Apr 21 | r11 | Gangwon FCGangwon FC | 0 - 1 | Gwangju FCGwangju FC |
| 20 Apr 21 | r11 | Pohang SteelersPohang Steele | 1 - 0 | Suwon FCSuwon FC |
| 21 Apr 21 | r11 | Ulsan Hyundai FCUlsan Hyundai | 0 - 0 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 21 Apr 21 | r11 | Seongnam FCSeongnam FC | 1 - 3 | Incheon United FCIncheon Unite |
| 21 Apr 21 | r11 | Daegu FCDaegu FC | 1 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| 21 Apr 21 | r11 | Jeju United FCJeju United F | 2 - 1 | FC SeoulFC Seoul |
| |
| 24 Apr 21 | r12 | Pohang SteelersPohang Steele | 0 - 0 | Jeju United FCJeju United F |
| 24 Apr 21 | r12 | Gwangju FCGwangju FC | 0 - 1 | Daegu FCDaegu FC |
| 24 Apr 21 | r12 | Gangwon FCGangwon FC | 1 - 1 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 25 Apr 21 | r12 | Incheon United FCIncheon Unite | 0 - 0 | Ulsan Hyundai FCUlsan Hyundai |
| 25 Apr 21 | r12 | Suwon FCSuwon FC | 1 - 1 | FC SeoulFC Seoul |
| 25 Apr 21 | r12 | Seongnam FCSeongnam FC | 0 - 1 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 30 Apr 21 | r13 | FC SeoulFC Seoul | 2 - 2 | Seongnam FCSeongnam FC |
| 01 May 21 | r13 | Suwon FCSuwon FC | 2 - 4 | Daegu FCDaegu FC |
| 01 May 21 | r13 | Suwon Samsung BluewingsSuwon Samsung | 1 - 1 | Pohang SteelersPohang Steele |
| 01 May 21 | r13 | Ulsan Hyundai FCUlsan Hyundai | 2 - 0 | Gwangju FCGwangju FC |
| 02 May 21 | r13 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 1 - 1 | Jeju United FCJeju United F |
| 02 May 21 | r13 | Incheon United FCIncheon Unite | 1 - 0 | Gangwon FCGangwon FC |
| |
| 08 May 21 | r14 | Daegu FCDaegu FC | 3 - 0 | Incheon United FCIncheon Unite |
| 08 May 21 | r14 | Jeju United FCJeju United F | 1 - 3 | Suwon FCSuwon FC |
| 08 May 21 | r14 | Pohang SteelersPohang Steele | 1 - 1 | Gangwon FCGangwon FC |
| 09 May 21 | r14 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 1 - 3 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 11 May 21 | r15 | Suwon FCSuwon FC | 2 - 1 | Gwangju FCGwangju FC |
| 11 May 21 | r15 | Incheon United FCIncheon Unite | 1 - 1 | Pohang SteelersPohang Steele |
| 12 May 21 | r15 | Suwon Samsung BluewingsSuwon Samsung | 3 - 2 | Jeju United FCJeju United F |
| 12 May 21 | r15 | Gangwon FCGangwon FC | 2 - 2 | Ulsan Hyundai FCUlsan Hyundai |
| |
| 15 May 21 | r16 | Gangwon FCGangwon FC | 0 - 0 | Suwon FCSuwon FC |
| 15 May 21 | r16 | Incheon United FCIncheon Unite | 2 - 1 | Gwangju FCGwangju FC |
| 16 May 21 | r16 | Jeju United FCJeju United F | 1 - 2 | Daegu FCDaegu FC |
| 16 May 21 | r16 | Ulsan Hyundai FCUlsan Hyundai | 1 - 1 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 18 May 21 | r17 | Suwon FCSuwon FC | 3 - 4 | Pohang SteelersPohang Steele |
| 19 May 21 | r17 | Gwangju FCGwangju FC | 0 - 0 | Jeju United FCJeju United F |
| 19 May 21 | r17 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 4 | Ulsan Hyundai FCUlsan Hyundai |
| 19 May 21 | r17 | Suwon Samsung BluewingsSuwon Samsung | 1 - 1 | Daegu FCDaegu FC |
| |
| 21 May 21 | r18 | Suwon FCSuwon FC | 2 - 2 | Incheon United FCIncheon Unite |
| 22 May 21 | r18 | Jeju United FCJeju United F | 2 - 2 | Seongnam FCSeongnam FC |
| 22 May 21 | r18 | Ulsan Hyundai FCUlsan Hyundai | 1 - 0 | Pohang SteelersPohang Steele |
| 23 May 21 | r18 | Gwangju FCGwangju FC | 3 - 4 | Suwon Samsung BluewingsSuwon Samsung |
| 23 May 21 | r18 | Gangwon FCGangwon FC | 0 - 0 | FC SeoulFC Seoul |
| 23 May 21 | r18 | Daegu FCDaegu FC | 1 - 0 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| |
| 29 May 21 | r19 | Incheon United FCIncheon Unite | 1 - 1 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 29 May 21 | r19 | Jeju United FCJeju United F | 1 - 2 | Ulsan Hyundai FCUlsan Hyundai |
| 29 May 21 | r19 | Seongnam FCSeongnam FC | 2 - 3 | Suwon FCSuwon FC |
| 29 May 21 | r19 | FC SeoulFC Seoul | 0 - 3 | Suwon Samsung BluewingsSuwon Samsung |
| 30 May 21 | r19 | Daegu FCDaegu FC | 1 - 0 | Gangwon FCGangwon FC |
| 30 May 21 | r19 | Pohang SteelersPohang Steele | 1 - 0 | Gwangju FCGwangju FC |
| |
| 06 Jun 21 | r15 | Seongnam FCSeongnam FC | 1 - 5 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 06 Jun 21 | r15 | Daegu FCDaegu FC | 1 - 1 | FC SeoulFC Seoul |
| |
| 19 Jun 21 | r14 | Gwangju FCGwangju FC | 1 - 1 | FC SeoulFC Seoul |
| 20 Jun 21 | r14 | Ulsan Hyundai FCUlsan Hyundai | 2 - 2 | Seongnam FCSeongnam FC |
| |
| 26 Jun 21 | r17 | Seongnam FCSeongnam FC | 1 - 2 | Gangwon FCGangwon FC |
| 14 Jul 21 | r17 | FC SeoulFC Seoul | 0 - 1 | Incheon United FCIncheon Unite |
| |
| 20 Jul 21 | r20 | Suwon Samsung BluewingsSuwon Samsung | 1 - 2 | Suwon FCSuwon FC |
| 21 Jul 21 | r20 | Gwangju FCGwangju FC | 3 - 1 | Gangwon FCGangwon FC |
| |
| 23 Jul 21 | r21 | Suwon Samsung BluewingsSuwon Samsung | 1 - 2 | Incheon United FCIncheon Unite |
| 24 Jul 21 | r21 | Pohang SteelersPohang Steele | 0 - 1 | FC SeoulFC Seoul |
| 25 Jul 21 | r21 | Ulsan Hyundai FCUlsan Hyundai | 2 - 5 | Suwon FCSuwon FC |
| 25 Jul 21 | r21 | Gangwon FCGangwon FC | 2 - 2 | Jeju United FCJeju United F |
| |
| 31 Jul 21 | r22 | FC SeoulFC Seoul | 0 - 0 | Ulsan Hyundai FCUlsan Hyundai |
| 31 Jul 21 | r22 | Jeju United FCJeju United F | 1 - 4 | Incheon United FCIncheon Unite |
| 01 Aug 21 | r22 | Gwangju FCGwangju FC | 0 - 0 | Seongnam FCSeongnam FC |
| 01 Aug 21 | r22 | Daegu FCDaegu FC | 1 - 1 | Pohang SteelersPohang Steele |
| 01 Aug 21 | r22 | Gangwon FCGangwon FC | 3 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 04 Aug 21 | r20 | Ulsan Hyundai FCUlsan Hyundai | 2 - 1 | Daegu FCDaegu FC |
| |
| 04 Aug 21 | r16 | Pohang SteelersPohang Steele | 1 - 0 | Seongnam FCSeongnam FC |
| |
| 04 Aug 21 | r22 | Suwon FCSuwon FC | 1 - 0 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| |
| 07 Aug 21 | r23 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 1 | Daegu FCDaegu FC |
| 07 Aug 21 | r23 | Ulsan Hyundai FCUlsan Hyundai | 2 - 1 | Gangwon FCGangwon FC |
| 07 Aug 21 | r23 | Suwon Samsung BluewingsSuwon Samsung | 0 - 0 | Jeju United FCJeju United F |
| 07 Aug 21 | r23 | Seongnam FCSeongnam FC | 1 - 0 | Pohang SteelersPohang Steele |
| 08 Aug 21 | r23 | FC SeoulFC Seoul | 1 - 0 | Gwangju FCGwangju FC |
| 08 Aug 21 | r23 | Incheon United FCIncheon Unite | 0 - 0 | Suwon FCSuwon FC |
| |
| 11 Aug 21 | r21 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 3 - 0 | Gwangju FCGwangju FC |
| |
| 14 Aug 21 | r25 | Gangwon FCGangwon FC | 2 - 0 | Daegu FCDaegu FC |
| 14 Aug 21 | r25 | Jeju United FCJeju United F | 2 - 2 | Ulsan Hyundai FCUlsan Hyundai |
| 14 Aug 21 | r25 | Suwon Samsung BluewingsSuwon Samsung | 1 - 2 | Seongnam FCSeongnam FC |
| 15 Aug 21 | r25 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 3 - 2 | FC SeoulFC Seoul |
| 15 Aug 21 | r25 | Pohang SteelersPohang Steele | 3 - 1 | Suwon FCSuwon FC |
| 15 Aug 21 | r25 | Gwangju FCGwangju FC | 1 - 0 | Incheon United FCIncheon Unite |
| |
| 18 Aug 21 | r20 | Incheon United FCIncheon Unite | 1 - 0 | Seongnam FCSeongnam FC |
| 18 Aug 21 | r20 | FC SeoulFC Seoul | 0 - 1 | Jeju United FCJeju United F |
| |
| 20 Aug 21 | r26 | Daegu FCDaegu FC | 1 - 2 | Gwangju FCGwangju FC |
| 21 Aug 21 | r26 | Seongnam FCSeongnam FC | 0 - 0 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 21 Aug 21 | r26 | Suwon FCSuwon FC | 1 - 0 | Jeju United FCJeju United F |
| 22 Aug 21 | r26 | FC SeoulFC Seoul | 2 - 2 | Pohang SteelersPohang Steele |
| 22 Aug 21 | r26 | Ulsan Hyundai FCUlsan Hyundai | 3 - 1 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 24 Aug 21 | r27 | Gwangju FCGwangju FC | 2 - 0 | Seongnam FCSeongnam FC |
| 25 Aug 21 | r27 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 0 | Pohang SteelersPohang Steele |
| 25 Aug 21 | r27 | FC SeoulFC Seoul | 1 - 2 | Ulsan Hyundai FCUlsan Hyundai |
| 25 Aug 21 | r27 | Incheon United FCIncheon Unite | 2 - 0 | Daegu FCDaegu FC |
| 25 Aug 21 | r27 | Suwon Samsung BluewingsSuwon Samsung | 0 - 3 | Suwon FCSuwon FC |
| |
| 28 Aug 21 | r28 | Pohang SteelersPohang Steele | 0 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| 28 Aug 21 | r28 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 2 | Suwon FCSuwon FC |
| 28 Aug 21 | r28 | Daegu FCDaegu FC | 3 - 1 | Seongnam FCSeongnam FC |
| 29 Aug 21 | r28 | Ulsan Hyundai FCUlsan Hyundai | 3 - 2 | Incheon United FCIncheon Unite |
| 29 Aug 21 | r28 | Jeju United FCJeju United F | 1 - 0 | FC SeoulFC Seoul |
| |
| 01 Sep 21 | r20 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 0 - 1 | Pohang SteelersPohang Steele |
| |
| 04 Sep 21 | r21 | Seongnam FCSeongnam FC | 0 - 0 | Daegu FCDaegu FC |
| |
| 05 Sep 21 | r16 | FC SeoulFC Seoul | 3 - 4 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| |
| 10 Sep 21 | r29 | Ulsan Hyundai FCUlsan Hyundai | 0 - 0 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 10 Sep 21 | r29 | Pohang SteelersPohang Steele | 1 - 2 | Daegu FCDaegu FC |
| 11 Sep 21 | r29 | Incheon United FCIncheon Unite | 1 - 2 | Jeju United FCJeju United F |
| 11 Sep 21 | r29 | Suwon Samsung BluewingsSuwon Samsung | 2 - 2 | Gwangju FCGwangju FC |
| 12 Sep 21 | r29 | Seongnam FCSeongnam FC | 1 - 1 | FC SeoulFC Seoul |
| 12 Sep 21 | r29 | Suwon FCSuwon FC | 1 - 0 | Gangwon FCGangwon FC |
| |
| 18 Sep 21 | r30 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 1 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| 18 Sep 21 | r30 | Gwangju FCGwangju FC | 1 - 1 | Jeju United FCJeju United F |
| 18 Sep 21 | r30 | Daegu FCDaegu FC | 2 - 1 | Ulsan Hyundai FCUlsan Hyundai |
| 19 Sep 21 | r30 | Incheon United FCIncheon Unite | 0 - 1 | Seongnam FCSeongnam FC |
| 19 Sep 21 | r30 | FC SeoulFC Seoul | 2 - 1 | Suwon FCSuwon FC |
| |
| 21 Sep 21 | r31 | Suwon Samsung BluewingsSuwon Samsung | 3 - 2 | Gangwon FCGangwon FC |
| 21 Sep 21 | r31 | Gwangju FCGwangju FC | 1 - 2 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 21 Sep 21 | r31 | Pohang SteelersPohang Steele | 1 - 2 | Ulsan Hyundai FCUlsan Hyundai |
| 22 Sep 21 | r31 | Jeju United FCJeju United F | 0 - 1 | Daegu FCDaegu FC |
| 22 Sep 21 | r31 | Suwon FCSuwon FC | 3 - 1 | Seongnam FCSeongnam FC |
| 22 Sep 21 | r31 | FC SeoulFC Seoul | 0 - 0 | Incheon United FCIncheon Unite |
| |
| 25 Sep 21 | r32 | Pohang SteelersPohang Steele | 2 - 4 | Jeju United FCJeju United F |
| 25 Sep 21 | r32 | Ulsan Hyundai FCUlsan Hyundai | 1 - 0 | Gwangju FCGwangju FC |
| 25 Sep 21 | r32 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 0 | Incheon United FCIncheon Unite |
| 25 Sep 21 | r32 | Daegu FCDaegu FC | 0 - 0 | Suwon FCSuwon FC |
| 26 Sep 21 | r32 | Suwon Samsung BluewingsSuwon Samsung | 0 - 2 | FC SeoulFC Seoul |
| 26 Sep 21 | r32 | Seongnam FCSeongnam FC | 2 - 0 | Gangwon FCGangwon FC |
| |
| 29 Sep 21 | r30 | Gangwon FCGangwon FC | 1 - 0 | Pohang SteelersPohang Steele |
| |
| 02 Oct 21 | r33 | Gangwon FCGangwon FC | 0 - 1 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 02 Oct 21 | r33 | Suwon FCSuwon FC | 0 - 3 | Ulsan Hyundai FCUlsan Hyundai |
| 02 Oct 21 | r33 | Incheon United FCIncheon Unite | 0 - 1 | Suwon Samsung BluewingsSuwon Samsung |
| 03 Oct 21 | r33 | Jeju United FCJeju United F | 2 - 1 | Seongnam FCSeongnam FC |
| 03 Oct 21 | r33 | Gwangju FCGwangju FC | 2 - 3 | Pohang SteelersPohang Steele |
| 03 Oct 21 | r33 | FC SeoulFC Seoul | 1 - 1 | Daegu FCDaegu FC |
| |
| 06 Oct 21 | r26 | Incheon United FCIncheon Unite | 0 - 1 | Gangwon FCGangwon FC |
| |
| 10 Oct 21 | r27 | Gangwon FCGangwon FC | 2 - 2 | Jeju United FCJeju United F |
| |
| 17 Oct 21 | r28 | Gangwon FCGangwon FC | 2 - 1 | Gwangju FCGwangju FC |
| |
| 24 Oct 21 | r24 | Jeju United FCJeju United F | 2 - 2 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 24 Oct 21 | r24 | Seongnam FCSeongnam FC | 2 - 1 | Ulsan Hyundai FCUlsan Hyundai |
| 24 Oct 21 | r24 | Daegu FCDaegu FC | 0 - 2 | Suwon Samsung BluewingsSuwon Samsung |
| 24 Oct 21 | r24 | Gangwon FCGangwon FC | 1 - 4 | FC SeoulFC Seoul |
| 24 Oct 21 | r24 | Suwon FCSuwon FC | 1 - 3 | Gwangju FCGwangju FC |
| 24 Oct 21 | r24 | Pohang SteelersPohang Steele | 0 - 1 | Incheon United FCIncheon Unite |
| |
| 30 Oct 21 | r01 | Incheon United FCIncheon Unite | 2 - 0 | FC SeoulFC Seoul |
| 30 Oct 21 | r01 | Suwon Samsung BluewingsSuwon Samsung | 0 - 4 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 30 Oct 21 | r01 | Seongnam FCSeongnam FC | 1 - 0 | Pohang SteelersPohang Steele |
| 31 Oct 21 | r01 | Daegu FCDaegu FC | 0 - 5 | Jeju United FCJeju United F |
| 31 Oct 21 | r01 | Ulsan Hyundai FCUlsan Hyundai | 3 - 2 | Suwon FCSuwon FC |
| 31 Oct 21 | r01 | Gwangju FCGwangju FC | 2 - 2 | Gangwon FCGangwon FC |
| |
| 03 Nov 21 | r02 | Pohang SteelersPohang Steele | 4 - 0 | Gangwon FCGangwon FC |
| 03 Nov 21 | r02 | Gwangju FCGwangju FC | 3 - 4 | FC SeoulFC Seoul |
| 03 Nov 21 | r02 | Seongnam FCSeongnam FC | 1 - 1 | Incheon United FCIncheon Unite |
| 06 Nov 21 | r02 | Jeju United FCJeju United F | 2 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| 06 Nov 21 | r02 | Suwon FCSuwon FC | 1 - 2 | Daegu FCDaegu FC |
| 06 Nov 21 | r02 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 3 - 2 | Ulsan Hyundai FCUlsan Hyundai |
| |
| 07 Nov 21 | r03 | Pohang SteelersPohang Steele | 1 - 2 | Gwangju FCGwangju FC |
| 07 Nov 21 | r03 | Gangwon FCGangwon FC | 1 - 1 | Incheon United FCIncheon Unite |
| 07 Nov 21 | r03 | FC SeoulFC Seoul | 3 - 0 | Seongnam FCSeongnam FC |
| 21 Nov 21 | r03 | Suwon FCSuwon FC | 3 - 2 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 21 Nov 21 | r03 | Ulsan Hyundai FCUlsan Hyundai | 3 - 1 | Jeju United FCJeju United F |
| 21 Nov 21 | r03 | Daegu FCDaegu FC | 2 - 1 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 27 Nov 21 | r04 | Jeju United FCJeju United F | 1 - 0 | Suwon FCSuwon FC |
| 27 Nov 21 | r04 | Seongnam FCSeongnam FC | 1 - 0 | Gwangju FCGwangju FC |
| 28 Nov 21 | r04 | Daegu FCDaegu FC | 0 - 2 | Jeonbuk Hyundai MotorsJeonbuk Hyund |
| 28 Nov 21 | r04 | Suwon Samsung BluewingsSuwon Samsung | 0 - 0 | Ulsan Hyundai FCUlsan Hyundai |
| 28 Nov 21 | r04 | Incheon United FCIncheon Unite | 0 - 0 | Pohang SteelersPohang Steele |
| 28 Nov 21 | r04 | FC SeoulFC Seoul | 0 - 0 | Gangwon FCGangwon FC |
| |
| 04 Dec 21 | r05 | Pohang SteelersPohang Steele | 1 - 2 | FC SeoulFC Seoul |
| 04 Dec 21 | r05 | Gangwon FCGangwon FC | 2 - 1 | Seongnam FCSeongnam FC |
| 04 Dec 21 | r05 | Gwangju FCGwangju FC | 1 - 1 | Incheon United FCIncheon Unite |
| 05 Dec 21 | r05 | Jeonbuk Hyundai MotorsJeonbuk Hyund | 2 - 0 | Jeju United FCJeju United F |
| 05 Dec 21 | r05 | Ulsan Hyundai FCUlsan Hyundai | 2 - 0 | Daegu FCDaegu FC |
| 05 Dec 21 | r05 | Suwon FCSuwon FC | 2 - 0 | Suwon Samsung BluewingsSuwon Samsung |
| |
| 08 Dec 21 | r00 | Daejeon Hana CitizenDaejeon Hana | 1 - 0 | Gangwon FCGangwon FC |
| 12 Dec 21 | r00 | Gangwon FCGangwon FC | 4 - 1 | Daejeon Hana CitizenDaejeon Hana |
Team 2021 Schedules
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