K-League leaders Suwon Bluewings were held to a disappointing 1-1 draw by lowly Seoul on Sunday.
Seoul's Montenegrin striker Dejan Damjanovic put his side in front after 21 minutes and it looked set to be the match-winner.
The visitors eventually gave way to Suwon's pressure with two minutes remaining when substitute Dzenan Radoncic scored his first goal of the season to earn his side a point.
The result sees Suwon move to 13 points, one ahead of the second-placed Pohang Steelers while Seoul are still searching for their first win of the season after six games.
In the day's other match, Seongnam moved away from the depths of the K-League table with a 2-1 win over Jeonbuk Motors.
Goals from Kim Dong-Sub and Kim In-Sung either side of the half effectively wrapped up the contest with Eninho scoring a consolation for Jeonbuk in the dying moments.