FC Seoul remain two points clear at the top of the K-League after a narrow 1-0 win over Seongnam Chunma.
Jin-Kyu Kim scored the only goal of the game midway through the first half as the pacesetters claimed their 10th win of the season.
Two last-minute goals ensured Suwon Bluewings kept up the chase with a 3-0 victory at Sangju Sangmu Phoenix.
Stevica Ristic put the visitors ahead in the 19th minute but there were no further goals until right at the death when Ristic got his second and Tae-Goon Ha also got on the scoresheet.
It ensured Suwon leapfrogged Jeonbuk Motors.
Ulsan Hyundai moved to within a point of Jeju after a 2-1 win over Busan I'Park.
All the goals came in the first half: Seung-Yong Kim scoring in the 23rd and 35th minutes, sandwiching a solitary reply by Chang-Soo Kim.
Daegu FC won 3-0 at Chunnam Dragons, the goals came from Dae-Yeol Kim(42), a George Leandro Lima penalty (50) and Je-Heon Song (77).
Rocha Caique's 57th-minute strike ensured Gyeongnam won at Gwangju FC, Kevin Oris struck twice in two minutes as Daejeon Citizen secured a 2-0 victory at Gangwon FC and bottom side Incheon United were denied only their second win of the season when Pohang Steelers' Won Il-Kim struck at the death to equalise In-Whan Jung's 29th-minute goal.