Lee Dong-gook scored twice in his comeback match as Jeonbuk Hyundai Motors beat Binh Duong of Vietnam 3-0 in the Asian Champions League on Tuesday.
Lee, returning from a six-month injury, struck on both sides of halftime, after the K-League Classic champions were shot ahead by Eninho in the 16th minute.
The result moved 2006 champion Jeonbuk to the top of Group E, while the Vietnamese champion lurches at the bottom after a third straight defeat.
Kashiwa Reysol also remained unbeaten in Group E after Naoki Wako scored off a header two minutes into injury time for a thrilling 2-1 win over Shandong Luneng of China.
Kosuke Taketomi gave Kashiwa Reysol the lead in the 23rd minute, and Walter Montillo equalized six minutes into the second half.
With the match seemingly headed for a draw, Wako rose to head home and beat goalkeeper Wang Dalei two minutes into injury time. Kashiwa Reysol was tied with Jeonbuk Hyundai on seven points.
Hwang Ui-jo's 26th-minute strike proved decisive for South Korea's Seongnam FC to beat China's Guangzhou R&F 1-0 in Group F.