Seongnam, led by manager Kim Nam-il in the K-League of professional football, fell to 11th place after losing 4 straight losses.
Seongnam, who fought 10 people with Park Soo-il's departure in the 27th minute of the first half, collapsed in the last minute.
In the 9th minute of the second half, Na Sang-ho scored the opening goal with a turning shot, but he couldn't hold up in the last 10 minutes and allowed 2 goals to lose to 2-1.
Seongnam, who fell into a 4th straight loss, was chased by one point at the bottom, and even manager Kim Nam-il, who protested right after the game, was sent off.
After resigning from coach Cho Duk-je, Busan beat One Seoul 2-1 and escaped from the 3rd straight victory and jumped to 10th place, and Incheon lost to Suwon 1-0 and became the bottom again.