Jeonbuk Motors clinched their third title in six seasons after beating Jeju United 3-0 last week, but Sangju Sangmu and Seongnam are running out of time to preserve their top-tier status at the other end of the table.
Sangju are five points adrift of safety at the foot of the relegation round table with three matches remaining as they prepare to face third-placed Incheon United at Sungui Arena Park on Saturday.
Park Hang-seo's Sangju - without a win in four matches - are three points from the relegation play-off spot, which is occupied by Seongnam, while Gyeongnam are a further two points clear.
Sangju drew 1-1 at home to Seongnam last week after Juna Yang's 73rd-minute penalty salvaged a point and ended their run of three consecutive defeats.
Seongnam host Gyeongnam at Tancheon Sports Complex on Saturday, with the result going a long way in determining Sangju's fate.
Kim Hak-bum's Seongnam - seven-time K-League Classic champions and dual AFC Asian Champions League winners - have drawn back-to-back games since the competition split for the champion and relegation round.
Chunnam are away at Busan I'Park in the other match.
