The 29-year-old scored his side's only goal in the 27th minute following Kim Jin-Su’s assist.
Gambian international, Mo Barrow has now scored his 29 league goal for Jeonbuk in 23 matches.
The victory moved Jeonbuk Hyundai Motors to 2nd position with 58 points, while the defeat maintained Seongnam FC at rock-bottom (12th) position with 24 points after 32 games.
