2021 Championship Group
| Pl | W | D | L | Diff | Pts | |||
| 1 | Jeonbuk | 38 | 22 | 10 | 6 | 71:37 | 34 | 76 |
| 2 | Ulsan Hyundai | 38 | 21 | 11 | 6 | 64:41 | 23 | 74 |
| 3 | Daegu | 38 | 15 | 10 | 13 | 41:48 | -7 | 55 |
| 4 | Jeju Utd | 38 | 13 | 15 | 10 | 52:44 | 8 | 54 |
| 5 | Suwon FC | 38 | 14 | 9 | 15 | 53:57 | -4 | 51 |
| 6 | Suwon Bluewings | 38 | 12 | 10 | 16 | 42:50 | -8 | 46 |
Promotion ~ AFC Champions League
Promotion ~ AFC Champions League (Qualification: )
2021 Main
| Pl | W | D | L | Diff | Pts | |||
| 1 | Jeonbuk | 33 | 18 | 10 | 5 | 58:32 | 26 | 64 |
| 2 | Ulsan Hyundai | 33 | 18 | 10 | 5 | 54:35 | 19 | 64 |
| 3 | Daegu | 33 | 13 | 10 | 10 | 37:37 | 0 | 49 |
| 4 | Suwon FC | 33 | 12 | 9 | 12 | 45:49 | -4 | 45 |
| 5 | Jeju Utd | 33 | 10 | 15 | 8 | 43:39 | 4 | 45 |
| 6 | Suwon Bluewings | 33 | 12 | 9 | 12 | 41:40 | 1 | 45 |
| 7 | Pohang | 33 | 11 | 9 | 13 | 35:40 | -5 | 42 |
| 8 | Incheon | 33 | 11 | 7 | 15 | 33:42 | -9 | 40 |
| 9 | Seoul | 33 | 9 | 10 | 14 | 37:40 | -3 | 37 |
| 10 | Gangwon | 33 | 9 | 10 | 14 | 35:43 | -8 | 37 |
| 11 | Seongnam | 33 | 9 | 10 | 14 | 30:40 | -10 | 37 |
| 12 | Gwangju FC | 33 | 9 | 5 | 19 | 34:45 | -11 | 32 |
Promotion ~ K League 1 (Championship Group: )
K League 1 (Relegation Group: )
2021 Relegation
Quarter-finals
| 1 | Gangwon | Bye | |
| 3 | Anyang | Bye | |
| 4 | Daejeon | Jeonnam | 0 : 0 |
Semi-finals
| 1 | Gangwon | Bye | |
| 2 | Anyang | Daejeon | 1 : 3 |
Final
| 1 | Gangwon | Daejeon | 4 : 1, 0 : 1 |
2021 Relegation Group
| Pl | W | D | L | Diff | Pts | |||
| 7 | Seoul | 38 | 12 | 11 | 15 | 46:46 | 0 | 47 |
| 8 | Incheon | 38 | 12 | 11 | 15 | 38:45 | -7 | 47 |
| 9 | Pohang | 38 | 12 | 10 | 16 | 41:45 | -4 | 46 |
| 10 | Seongnam | 38 | 11 | 11 | 16 | 34:46 | -12 | 44 |
| 11 | Gangwon | 38 | 10 | 13 | 15 | 40:51 | -11 | 43 |
| 12 | Gwangju FC | 38 | 10 | 7 | 21 | 42:54 | -12 | 37 |
K League 1 (Relegation)
Relegation ~ K League 2
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