The Steelers have won five and drawn two of their last seven matches in all competitions, extending that record when they secured a 3-0 home victory over Gyeongnam on Wednesday.
Ulsan's midweek 1-0 home defeat to Seongnam ensured a three-way tie on 13 points at the top of the table, with Cho Min-Kook's pacesetters heading things on goal difference from Steelers and Jeju.
Last year's runners-up won their first three games of the season, but they have suffered a dip in form of late.
Seoul are another side who have not got going in the first seven games and they will see Saturday's home encounter with Gyeongnam as an opportunity to kick-start their campaign.
Elsewhere, Sangju Sangmu travel to Seongnam and Jeonnam Dragons host Busan I'Park in the other games to be played on Sunday.
