There are a total of 12 teams in the Korean K League. The match is based on three rounds of home and away matches (the third round of home team is determined by drawing lots). The first stage is the regular season. The winner gets 3 points, the loser gets no points, and the two teams each get 1 point in the draw. Finally, the ranking is determined by the score, and the ranking is determined by the number of goals. The second stage is divided into two groups: the first six players in the regular competition directly enter the championship group, and the last six players enter the relegation group. Finally, the ranking is determined by the total score, and the ranking is determined by the net goal. The team ranking the first in the championship group will directly participate in the Asian Championship group match, and the second and third teams will participate in the Asian Championship qualification match. The fifth place in the relegation group will compete with the second place in the K2 league, and the fourth place will compete with the third place in the K2 league (3-5 winners of the play offs) for promotion and demotion. The last place in the relegation group is directly relegated to the K2 league.