The Pohang Steelers moved to the top of the K-League after beating Gangwon 3-0 at the Gangneung Stadium on Tuesday.
Goals from Ko Mu-Yeol, Park Seong-Ho and Moon Chang-Jin sealed an ultimately comfortable win for the away side against cellar dwellers Gangwon.
The Steelers have 15 points, but have played a game more than their closest rival the Suwon Blue Wings, who could reclaim top spot if they beat Busan I'Park on Wednesday.
Pohang took an 18th-minute lead when a free-kick from the right was directed in by Ko Mu-Yeol.
The home side missed a great chance to equalise shortly after but Brazilian forward Patrick shoot wide.
Pohang made them pay for their wastefulness in the second half with two further goals.
Substitute Park Seong-Ho first made it 2-0 with a lovely turn and shot into the top left corner.
And another substitute made it 3-0 in stoppage time - Moon Chang-Jin turning in a simple close-range chance to complete a miserable day for Gangwon.
In Tuesday's other match third-placed Incheon United drew 0-0 with Chunnam Dragons.