Jeonbuk Motors recorded their first victory of the AFC Champions League campaign on Wednesday, while Brisbane Roar remain winless.
Last year's runners-up Jeonbuk ended Thai champions Buriram United's dream start in Group H with a 2-0 win.
Veteran striker Lee Dong-Gook broke the deadlock after nine minutes and Seo Sang-Min added a second just after the half-hour to complete a comfortable win for the K-League champions, who remain bottom of the group.
In the other Group H encounter, Kashiwa Reysol and Guangzhou Evergrande played out an uninspiring 0-0 draw to stay second and third respectively.
Elsewhere, honours were shared in South Korea where A-League champions Brisbane Roar held on for a 1-1 draw with Ulsan Hyundai in their Group F clash.
Nick Fitzgerald had fired Brisbane into the lead on 36 minutes with a low drive after some fine build-up play.
Ulsan had the chance to level shortly after the break when Kim Seung-Yong was brought down by Matthew Jurman in the area, with the Roar defender sent off for denying a clear goalscoring opportunity.
But Brisbane shot-stopper Michael Theoklitos kept out Lee Keun-Ho's spot-kick to keep his side ahead.
Ulsan were level on 55 minutes, however, when Lee Jae-Sung fired home after Brisbane failed to clear a corner, leaving Roar bottom of the group.
Tokyo are top of the group after Aria Hasegawa cancelled out Wang Xiaolong's 11th-minute penalty to earn them a 1-1 draw at Beijing Guoan.
In Group B, Pakhtakor claimed their first victory of the campaign with a 3-1 a triumph over Qatari outfit Al Arabi.
Sherzod Karimov got the Uzbek side off to a flying start with a goal on nine minutes but Al Arabi levelled through Argentine star Leonardo Pisculichi.
It remained 1-1 until the 74th minute, when Pakhtakor went on to win the game courtesy of goals from Dilshod Sharofetdinov and Temurkhuja Abdukholikov.
Iran's Persepolis moved four points clear atop Group D with a 3-0 win at Qatar's Al Gharafa.
Gholamreza Rezaei and Eamon Zayed struck in the opening five minutes, before Javad Kazemian netted the sealer in the second half.
United Arab Emirates Pro-League outfit Al Shabab and Saudi Premier League champions Al Hilal drew 1-1 after Ciel and Yoo Byung-Soo traded goals.