JINAN, east China - Former champions Jeonbuk Motors maintained an unbeaten record in the AFC Champions League this season as second half goals from Han Kyo-won, Lee Jae-sung and Leonardo secured an eye-catching 4-1 away win over Chinese Super League side Shandong Luneng on Tuesday.

Edu's audacious first half chip had handed 2006 winners Jeonbuk the lead after 21 minutes only for Shandong's Yang Xu to level the scores with his third goal in two games just before the hour mark.

But with Han, Lee and Leonardo netting inside the final 20 minutes, K-League champions Jeonbuk added to last week's goalless draw with Japan's Kashiwa Reysol in Group E.

Chinese FA Cup winners Shandong, meanwhile, were unable to add to their opening day 3-2 win over Vietnam champions Binh Duong, as goalscorer Yang was dismissed with just over 10 minutes remaining for the home side.

Luneng head coach Cuca said the main reason for the defeat was weak defense.

"The first half was very close, but Jeonbuk seized a chance to score," said Cuca. "We had a very good start for the second half as we levelled. However, their forward made full use of every chance to score, and our defense was too weak, especially after Yang Xu was given a red card."