| 27 Feb 21 | r01        | Gyeongnam FCGyeongnam FC | 1 - 2 | AnyangAnyang |
| 27 Feb 21 | r01        | Ansan GreenersAnsan Greener | 1 - 1 | Sangju SangmuSangju Sangmu |
| 27 Feb 21 | r01        | Jeonnam DragonsJeonnam Drago | 0 - 0 | Chungnam AsanChungnam Asan |
| 28 Feb 21 | r01        | Bucheon FC 1995Bucheon FC 19 | 1 - 2 | Daejeon Hana CitizenDaejeon Hana |
| 28 Feb 21 | r01        | Busan IParkBusan IPark | 0 - 3 | Seoul E-LandSeoul E-Land |
| |
| 06 Mar 21 | r02        | Chungnam AsanChungnam Asan | 0 - 1 | Bucheon FC 1995Bucheon FC 19 |
| 06 Mar 21 | r02        | Seoul E-LandSeoul E-Land | 4 - 0 | Sangju SangmuSangju Sangmu |
| 06 Mar 21 | r02        | AnyangAnyang | 1 - 2 | Ansan GreenersAnsan Greener |
| 07 Mar 21 | r02        | Daejeon Hana CitizenDaejeon Hana | 1 - 2 | Busan IParkBusan IPark |
| 07 Mar 21 | r02        | Jeonnam DragonsJeonnam Drago | 1 - 0 | Gyeongnam FCGyeongnam FC |
| |
| 13 Mar 21 | r03        | Ansan GreenersAnsan Greener | 1 - 2 | Gyeongnam FCGyeongnam FC |
| 13 Mar 21 | r03        | Chungnam AsanChungnam Asan | 4 - 0 | Busan IParkBusan IPark |
| 14 Mar 21 | r03        | Seoul E-LandSeoul E-Land | 1 - 1 | Jeonnam DragonsJeonnam Drago |
| 14 Mar 21 | r03        | Bucheon FC 1995Bucheon FC 19 | 0 - 0 | AnyangAnyang |
| 14 Mar 21 | r03        | Daejeon Hana CitizenDaejeon Hana | 1 - 2 | Sangju SangmuSangju Sangmu |
| |
| 20 Mar 21 | r04        | Bucheon FC 1995Bucheon FC 19 | 1 - 1 | Jeonnam DragonsJeonnam Drago |
| 20 Mar 21 | r04        | AnyangAnyang | 0 - 1 | Daejeon Hana CitizenDaejeon Hana |
| 20 Mar 21 | r04        | Ansan GreenersAnsan Greener | 1 - 0 | Chungnam AsanChungnam Asan |
| 21 Mar 21 | r04        | Gyeongnam FCGyeongnam FC | 0 - 0 | Seoul E-LandSeoul E-Land |
| 21 Mar 21 | r04        | Busan IParkBusan IPark | 2 - 1 | Sangju SangmuSangju Sangmu |
| |
| 03 Apr 21 | r05        | Chungnam AsanChungnam Asan | 2 - 1 | Gyeongnam FCGyeongnam FC |
| 03 Apr 21 | r05        | Busan IParkBusan IPark | 1 - 1 | Ansan GreenersAnsan Greener |
| 04 Apr 21 | r05        | Jeonnam DragonsJeonnam Drago | 1 - 2 | Daejeon Hana CitizenDaejeon Hana |
| 04 Apr 21 | r05        | Sangju SangmuSangju Sangmu | 0 - 0 | AnyangAnyang |
| 04 Apr 21 | r05        | Seoul E-LandSeoul E-Land | 4 - 0 | Bucheon FC 1995Bucheon FC 19 |
| |
| 10 Apr 21 | r06        | Seoul E-LandSeoul E-Land | 0 - 1 | Chungnam AsanChungnam Asan |
| 10 Apr 21 | r06        | Sangju SangmuSangju Sangmu | 1 - 0 | Bucheon FC 1995Bucheon FC 19 |
| 11 Apr 21 | r06        | Ansan GreenersAnsan Greener | 0 - 1 | Jeonnam DragonsJeonnam Drago |
| 11 Apr 21 | r06        | AnyangAnyang | 2 - 1 | Busan IParkBusan IPark |
| 11 Apr 21 | r06        | Daejeon Hana CitizenDaejeon Hana | 2 - 1 | Gyeongnam FCGyeongnam FC |
| |
| 17 Apr 21 | r07        | Daejeon Hana CitizenDaejeon Hana | 2 - 1 | Seoul E-LandSeoul E-Land |
| 17 Apr 21 | r07        | Bucheon FC 1995Bucheon FC 19 | 0 - 1 | Ansan GreenersAnsan Greener |
| 17 Apr 21 | r07        | Gyeongnam FCGyeongnam FC | 1 - 2 | Busan IParkBusan IPark |
| 18 Apr 21 | r07        | AnyangAnyang | 2 - 1 | Chungnam AsanChungnam Asan |
| 18 Apr 21 | r07        | Jeonnam DragonsJeonnam Drago | 2 - 1 | Sangju SangmuSangju Sangmu |
| |
| 24 Apr 21 | r08        | Gyeongnam FCGyeongnam FC | 3 - 0 | Bucheon FC 1995Bucheon FC 19 |
| 24 Apr 21 | r08        | Ansan GreenersAnsan Greener | 1 - 0 | Daejeon Hana CitizenDaejeon Hana |
| 24 Apr 21 | r08        | Busan IParkBusan IPark | 0 - 1 | Jeonnam DragonsJeonnam Drago |
| 25 Apr 21 | r08        | Seoul E-LandSeoul E-Land | 1 - 2 | AnyangAnyang |
| 25 Apr 21 | r08        | Chungnam AsanChungnam Asan | 1 - 2 | Sangju SangmuSangju Sangmu |
| |
| 01 May 21 | r09        | Jeonnam DragonsJeonnam Drago | 0 - 1 | AnyangAnyang |
| 01 May 21 | r09        | Daejeon Hana CitizenDaejeon Hana | 1 - 1 | Chungnam AsanChungnam Asan |
| 02 May 21 | r09        | Sangju SangmuSangju Sangmu | 1 - 2 | Gyeongnam FCGyeongnam FC |
| 02 May 21 | r09        | Bucheon FC 1995Bucheon FC 19 | 0 - 2 | Busan IParkBusan IPark |
| 02 May 21 | r09        | Seoul E-LandSeoul E-Land | 1 - 0 | Ansan GreenersAnsan Greener |
| |
| 05 May 21 | r10        | Sangju SangmuSangju Sangmu | 1 - 0 | Busan IParkBusan IPark |
| 05 May 21 | r10        | Daejeon Hana CitizenDaejeon Hana | 1 - 1 | Jeonnam DragonsJeonnam Drago |
| 05 May 21 | r10        | Seoul E-LandSeoul E-Land | 1 - 1 | Gyeongnam FCGyeongnam FC |
| 05 May 21 | r10        | AnyangAnyang | 2 - 0 | Bucheon FC 1995Bucheon FC 19 |
| |
| 08 May 21 | r11        | Bucheon FC 1995Bucheon FC 19 | 0 - 0 | Sangju SangmuSangju Sangmu |
| 09 May 21 | r11        | Gyeongnam FCGyeongnam FC | 0 - 2 | Jeonnam DragonsJeonnam Drago |
| 10 May 21 | r11        | Busan IParkBusan IPark | 4 - 1 | Daejeon Hana CitizenDaejeon Hana |
| 10 May 21 | r11        | Ansan GreenersAnsan Greener | 3 - 2 | AnyangAnyang |
| |
| 15 May 21 | r12        | Sangju SangmuSangju Sangmu | 1 - 1 | Daejeon Hana CitizenDaejeon Hana |
| 16 May 21 | r12        | AnyangAnyang | 0 - 1 | Gyeongnam FCGyeongnam FC |
| 17 May 21 | r12        | Jeonnam DragonsJeonnam Drago | 2 - 0 | Ansan GreenersAnsan Greener |
| 17 May 21 | r12        | Bucheon FC 1995Bucheon FC 19 | 1 - 1 | Seoul E-LandSeoul E-Land |
| |
| 22 May 21 | r13        | Ansan GreenersAnsan Greener | 1 - 1 | Seoul E-LandSeoul E-Land |
| 23 May 21 | r13        | Jeonnam DragonsJeonnam Drago | 1 - 2 | Busan IParkBusan IPark |
| 23 May 21 | r13        | Gyeongnam FCGyeongnam FC | 2 - 1 | Chungnam AsanChungnam Asan |
| 23 May 21 | r13        | AnyangAnyang | 0 - 0 | Sangju SangmuSangju Sangmu |
| 24 May 21 | r13        | Daejeon Hana CitizenDaejeon Hana | 4 - 1 | Bucheon FC 1995Bucheon FC 19 |
| |
| 29 May 21 | r14        | Busan IParkBusan IPark | 1 - 1 | Bucheon FC 1995Bucheon FC 19 |
| 29 May 21 | r14        | Seoul E-LandSeoul E-Land | 0 - 1 | Daejeon Hana CitizenDaejeon Hana |
| 30 May 21 | r14        | Gyeongnam FCGyeongnam FC | 1 - 1 | Ansan GreenersAnsan Greener |
| 30 May 21 | r14        | Chungnam AsanChungnam Asan | 2 - 2 | AnyangAnyang |
| 30 May 21 | r14        | Sangju SangmuSangju Sangmu | 1 - 1 | Jeonnam DragonsJeonnam Drago |
| |
| 05 Jun 21 | r15        | Jeonnam DragonsJeonnam Drago | 3 - 0 | Seoul E-LandSeoul E-Land |
| 05 Jun 21 | r15        | Busan IParkBusan IPark | 2 - 3 | Gyeongnam FCGyeongnam FC |
| 05 Jun 21 | r15        | Bucheon FC 1995Bucheon FC 19 | 1 - 0 | Chungnam AsanChungnam Asan |
| 06 Jun 21 | r15        | Daejeon Hana CitizenDaejeon Hana | 1 - 2 | AnyangAnyang |
| 06 Jun 21 | r15        | Sangju SangmuSangju Sangmu | 3 - 0 | Ansan GreenersAnsan Greener |
| |
| 12 Jun 21 | r16        | AnyangAnyang | 0 - 0 | Seoul E-LandSeoul E-Land |
| 12 Jun 21 | r16        | Chungnam AsanChungnam Asan | 3 - 1 | Daejeon Hana CitizenDaejeon Hana |
| 13 Jun 21 | r16        | Jeonnam DragonsJeonnam Drago | 0 - 2 | Bucheon FC 1995Bucheon FC 19 |
| 13 Jun 21 | r16        | Ansan GreenersAnsan Greener | 2 - 3 | Busan IParkBusan IPark |
| 13 Jun 21 | r16        | Gyeongnam FCGyeongnam FC | 1 - 2 | Sangju SangmuSangju Sangmu |
| |
| 16 Jun 21 | r11        | Chungnam AsanChungnam Asan | 0 - 0 | Seoul E-LandSeoul E-Land |
| |
| 19 Jun 21 | r17        | Sangju SangmuSangju Sangmu | 2 - 0 | Seoul E-LandSeoul E-Land |
| 19 Jun 21 | r17        | Daejeon Hana CitizenDaejeon Hana | 0 - 0 | Ansan GreenersAnsan Greener |
| 20 Jun 21 | r17        | Bucheon FC 1995Bucheon FC 19 | 1 - 1 | Gyeongnam FCGyeongnam FC |
| 20 Jun 21 | r17        | Chungnam AsanChungnam Asan | 0 - 1 | Jeonnam DragonsJeonnam Drago |
| 20 Jun 21 | r17        | Busan IParkBusan IPark | 4 - 5 | AnyangAnyang |
| |
| 23 Jun 21 | r10        | Chungnam AsanChungnam Asan | 0 - 2 | Ansan GreenersAnsan Greener |
| |
| 26 Jun 21 | r18        | Gyeongnam FCGyeongnam FC | 1 - 2 | Daejeon Hana CitizenDaejeon Hana |
| 27 Jun 21 | r18        | Seoul E-LandSeoul E-Land | 0 - 1 | Busan IParkBusan IPark |
| 27 Jun 21 | r18        | Ansan GreenersAnsan Greener | 2 - 2 | Bucheon FC 1995Bucheon FC 19 |
| 28 Jun 21 | r18        | Sangju SangmuSangju Sangmu | 3 - 1 | Chungnam AsanChungnam Asan |
| 28 Jun 21 | r18        | AnyangAnyang | 0 - 0 | Jeonnam DragonsJeonnam Drago |
| |
| 03 Jul 21 | r19        | Daejeon Hana CitizenDaejeon Hana | 1 - 4 | Sangju SangmuSangju Sangmu |
| 04 Jul 21 | r19        | Bucheon FC 1995Bucheon FC 19 | 0 - 0 | Busan IParkBusan IPark |
| 04 Jul 21 | r19        | AnyangAnyang | 1 - 0 | Chungnam AsanChungnam Asan |
| 05 Jul 21 | r19        | Seoul E-LandSeoul E-Land | 0 - 0 | Ansan GreenersAnsan Greener |
| 05 Jul 21 | r19        | Jeonnam DragonsJeonnam Drago | 0 - 0 | Gyeongnam FCGyeongnam FC |
| |
| 08 Jul 21 | r12        | Busan IParkBusan IPark | 0 - 0 | Chungnam AsanChungnam Asan |
| |
| 10 Jul 21 | r20        | Sangju SangmuSangju Sangmu | 2 - 4 | AnyangAnyang |
| 10 Jul 21 | r20        | Daejeon Hana CitizenDaejeon Hana | 0 - 2 | Seoul E-LandSeoul E-Land |
| 11 Jul 21 | r20        | Busan IParkBusan IPark | 0 - 1 | Jeonnam DragonsJeonnam Drago |
| 12 Jul 21 | r20        | Ansan GreenersAnsan Greener | 3 - 1 | Gyeongnam FCGyeongnam FC |
| 12 Jul 21 | r20        | Chungnam AsanChungnam Asan | 1 - 0 | Bucheon FC 1995Bucheon FC 19 |