The AFC Champions League quarter-finalists were forced to play the final 20 minutes with 10 men, after Park Jin-seob was shown a second yellow card for a late tackle.

Kim Dong-hun had the best chance for Seongam in a tight first half but he saw his shot well saved by Seoul goalkeeper Kim Byung-ji.

Seoul's Jung Jo-gook forced a good save out of Seongnam goalkeeper Kim Young-dae with a shot from close range after half-time.

Seongnam moved up to 28 points and second-placed Suwon Samsung Bluewings missed the chance to cut the gap at the top to four points as they were also held to a goalless draw at Pohang Steelers.

High-flying Gyeongnam FC moved within a point of Suwon as they heaped further misery on winless Gwangju Sangmu, hammering the bottom side 4-0.

Ulsan Hyundai Horang-i are level on points with Gyeongnam as they continued their recent good form with a 1-0 victory over Incheon United thanks to a strike from Yang Dong-hyun with 14 minutes remaining.

AFC Champions League holders Jeonbuk Hyundai Motors are in action on Sunday evening at Chunnam Dragons.