Jeju United joined Suwon Bluewings at the top of the K-League table with a 2-0 home win over Daegu FC.
Second-half goals from Brazilian duo Robert and Jair secured a win that moved Jeju level with the Bluewings, who could only draw 1-1 at Chunnam Dragons.
Dzenan Radoncic grabbed the equaliser for the visitors on 52 minutes after Lee Jong-Ho's seventh-minute opener.
Daejeon Citizen remain pointless after six games as a late Jose Fagner goal snatched the three points for Busan I'Park.
Kim Eun-Jung scored twice as Gangwon FC beat Incheon United 2-1. Kim netted a 20th-minute penalty and his 80th-minute strike was the match-winner after Seol Ki-Hyeon equalised.