| 27 Feb 21 | r01        | Ansan GreenersAnsan Greener | 1 - 1 | Sangju SangmuSangju Sangmu |
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| 06 Mar 21 | r02        | AnyangAnyang | 1 - 2 | Ansan GreenersAnsan Greener |
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| 13 Mar 21 | r03        | Ansan GreenersAnsan Greener | 1 - 2 | Gyeongnam FCGyeongnam FC |
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| 20 Mar 21 | r04        | Ansan GreenersAnsan Greener | 1 - 0 | Chungnam AsanChungnam Asan |
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| 03 Apr 21 | r05        | Busan IParkBusan IPark | 1 - 1 | Ansan GreenersAnsan Greener |
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| 11 Apr 21 | r06        | Ansan GreenersAnsan Greener | 0 - 1 | Jeonnam DragonsJeonnam Drago |
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| 17 Apr 21 | r07        | Bucheon FC 1995Bucheon FC 19 | 0 - 1 | Ansan GreenersAnsan Greener |
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| 24 Apr 21 | r08        | Ansan GreenersAnsan Greener | 1 - 0 | Daejeon Hana CitizenDaejeon Hana |
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| 02 May 21 | r09        | Seoul E-LandSeoul E-Land | 1 - 0 | Ansan GreenersAnsan Greener |
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| 10 May 21 | r11        | Ansan GreenersAnsan Greener | 3 - 2 | AnyangAnyang |
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| 17 May 21 | r12        | Jeonnam DragonsJeonnam Drago | 2 - 0 | Ansan GreenersAnsan Greener |
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| 22 May 21 | r13        | Ansan GreenersAnsan Greener | 1 - 1 | Seoul E-LandSeoul E-Land |
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| 30 May 21 | r14        | Gyeongnam FCGyeongnam FC | 1 - 1 | Ansan GreenersAnsan Greener |
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| 06 Jun 21 | r15        | Sangju SangmuSangju Sangmu | 3 - 0 | Ansan GreenersAnsan Greener |
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| 13 Jun 21 | r16        | Ansan GreenersAnsan Greener | 2 - 3 | Busan IParkBusan IPark |
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| 19 Jun 21 | r17        | Daejeon Hana CitizenDaejeon Hana | 0 - 0 | Ansan GreenersAnsan Greener |
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| 23 Jun 21 | r10        | Chungnam AsanChungnam Asan | 0 - 2 | Ansan GreenersAnsan Greener |
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| 27 Jun 21 | r18        | Ansan GreenersAnsan Greener | 2 - 2 | Bucheon FC 1995Bucheon FC 19 |
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| 05 Jul 21 | r19        | Seoul E-LandSeoul E-Land | 0 - 0 | Ansan GreenersAnsan Greener |
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| 12 Jul 21 | r20        | Ansan GreenersAnsan Greener | 3 - 1 | Gyeongnam FCGyeongnam FC |
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| 17 Jul 21 | r21        | Busan IParkBusan IPark | 4 - 0 | Ansan GreenersAnsan Greener |
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| 24 Jul 21 | r22        | Ansan GreenersAnsan Greener | 0 - 1 | Sangju SangmuSangju Sangmu |
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| 01 Aug 21 | r23        | Ansan GreenersAnsan Greener | 1 - 1 | Jeonnam DragonsJeonnam Drago |
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| 08 Aug 21 | r24        | Bucheon FC 1995Bucheon FC 19 | 4 - 3 | Ansan GreenersAnsan Greener |
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| 15 Aug 21 | r25        | Ansan GreenersAnsan Greener | 0 - 2 | Daejeon Hana CitizenDaejeon Hana |
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| 21 Aug 21 | r26        | Ansan GreenersAnsan Greener | 0 - 1 | Chungnam AsanChungnam Asan |
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| 30 Aug 21 | r27        | AnyangAnyang | 1 - 1 | Ansan GreenersAnsan Greener |
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| 05 Sep 21 | r28        | Ansan GreenersAnsan Greener | 1 - 2 | Bucheon FC 1995Bucheon FC 19 |
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| 12 Sep 21 | r29        | Ansan GreenersAnsan Greener | 1 - 1 | Busan IParkBusan IPark |
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| 19 Sep 21 | r30        | Chungnam AsanChungnam Asan | 0 - 1 | Ansan GreenersAnsan Greener |
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| 25 Sep 21 | r31        | Ansan GreenersAnsan Greener | 1 - 0 | AnyangAnyang |
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| 02 Oct 21 | r32        | Sangju SangmuSangju Sangmu | 1 - 0 | Ansan GreenersAnsan Greener |
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| 10 Oct 21 | r33        | Daejeon Hana CitizenDaejeon Hana | 4 - 1 | Ansan GreenersAnsan Greener |
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| 16 Oct 21 | r34        | Gyeongnam FCGyeongnam FC | 0 - 2 | Ansan GreenersAnsan Greener |
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| 23 Oct 21 | r35        | Ansan GreenersAnsan Greener | 0 - 3 | Seoul E-LandSeoul E-Land |
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| 31 Oct 21 | r36        | Jeonnam DragonsJeonnam Drago | 2 - 3 | Ansan GreenersAnsan Greener |