The top five teams of the regular season qualified for the championship playoffs, and winners of the regular season advanced to the final directly.
On the other hand, eight teams of participating teams had to be relegated to the K3 League Basic, founded as the second division of the K3 League in 2017.
When the first round and semi-final matches were finished as draws, their winners were decided on the regular season rankings without extra time and the penalty shoot-out.
FC Pocheon won 4–2 on aggregate.
This article about a South Korean football competition is a stub.