gain promotion via a two-game playoff series against the 14th-place team in the 2025 K3 League.

Also for the 2025 season, and following the example of K League, match day squad lists have increased from 18 to 20 players. At least three players must be Korean nationals, aged 23 or younger, and at least one of the three must be in the starting eleven. The Asian player quota has been removed, and teams may now include 4 foreign players of any nationality.

K4 League teams are allowed to recruit

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