The 16 participating teams played each other twice in a double round-robin format.
The 15th and 16th-placed teams were going to be automatically relegated to the K4 League,[3][4] but the 15th-placed team qualified for the relegation play-off instead of the 14th-placed team after the dissolution of K4 League club Daejeon Hana Citizen B was decided.
[5] Runners-up Hwaseong FC turned professional after the season ended and joined K League 2 ahead of the 2025 season.
[6][7] Promoted from K4 League Relegated to K4 League The number of foreign players is restricted to three per team, or four per team if one player is from an AFC country.
[3] The relegation play-off was contested between the 15th-placed team of K3 League and the third-placed team of K4 League (instead of runners-up Daejeon Hana Citizen B).