2021 Additional match
Final
| 1 | KT Wiz Suwon | Samsung Lions | 1 : 0 |
2021 Main
| Pl | W | D | L | PCT | |||
| 1 | KT Wiz Suwon | 144 | 76 | 9 | 59 | 719:584 | 0.559 |
| 2 | Samsung Lions | 144 | 76 | 9 | 59 | 712:658 | 0.559 |
| 3 | LG Twins | 144 | 72 | 14 | 58 | 654:561 | 0.549 |
| 4 | Doosan Bears | 144 | 71 | 8 | 65 | 738:656 | 0.521 |
| 5 | Kiwoom Heroes | 144 | 70 | 7 | 67 | 722:700 | 0.510 |
| 6 | SSG Landers | 144 | 66 | 14 | 64 | 755:741 | 0.507 |
| 7 | NC Dinos | 144 | 67 | 9 | 68 | 702:697 | 0.497 |
| 8 | Lotte Giants | 144 | 65 | 8 | 71 | 727:808 | 0.479 |
| 9 | KIA Tigers | 144 | 58 | 10 | 76 | 568:752 | 0.438 |
| 10 | Hanwha Eagles | 144 | 49 | 12 | 83 | 599:739 | 0.382 |
Promotion ~ KBO (Play Offs: Final)
Promotion ~ KBO (Play Offs: Semi~finals)
Promotion ~ KBO (Play Offs: Quarter~finals)
Promotion ~ KBO (Play Offs: 1/8~finals)
2021 Play Offs
1/8-finals
| 1 | KT Wiz Suwon (1) | Bye | |
| 5 | Samsung Lions (2) | Bye | |
| 7 | LG Twins (3) | Bye | |
| 8 | Doosan Bears (4) | Kiwoom Heroes (5) | 2 : 1 |
Quarter-finals
| 1 | KT Wiz Suwon (1) | Bye | |
| 3 | Samsung Lions (2) | Bye | |
| 4 | LG Twins (3) | Doosan Bears (4) | 1 : 2 |
Semi-finals
| 1 | KT Wiz Suwon (1) | Bye | |
| 2 | Samsung Lions (2) | Doosan Bears (4) | 0 : 2 |
Final
| 1 | KT Wiz Suwon (1) | Doosan Bears (4) | 4 : 0 |
2021 Pre-season
| Pl | W | D | L | PCT | |||
| 1 | Hanwha Eagles | 7 | 6 | 0 | 1 | 41:29 | 0.857 |
| 2 | KT Wiz Suwon | 7 | 5 | 1 | 1 | 54:26 | 0.786 |
| 3 | Lotte Giants | 7 | 4 | 1 | 2 | 29:21 | 0.643 |
| 4 | Samsung Lions | 7 | 2 | 3 | 2 | 44:40 | 0.500 |
| 5 | Kiwoom Heroes | 7 | 2 | 3 | 2 | 30:35 | 0.500 |
| 6 | LG Twins | 8 | 3 | 1 | 4 | 28:35 | 0.438 |
| 7 | KIA Tigers | 7 | 3 | 0 | 4 | 39:27 | 0.429 |
| 8 | Doosan Bears | 6 | 2 | 0 | 4 | 26:34 | 0.333 |
| 9 | NC Dinos | 7 | 1 | 2 | 4 | 29:54 | 0.286 |
| 10 | SSG Landers | 7 | 1 | 1 | 5 | 25:44 | 0.214 |
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