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Ulsan, who finished runners-up after being blocked by Jeonbuk for three consecutive years in the K-League, laughed first in the first match of the season.
New foreign striker Leonardo scored the winning goal.
This is Correspondent Ha Seong-ryong.
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Yoo Young, who performed dazzlingly at the Beijing Olympics, lightly figure jumped from the ground instead of silver, and then kicked vigorously.
In the big match between Jeonbuk and Ulsan, which started with Yoo Young's start, the away team Ulsan blocked Jeonbuk's attack with goalkeeper Jo Hyun-woo's dazzling save show and took the lead in the 39th minute.
Jeonbuk cleared Amano's corner kick, and Seol Young-Woo threw the ball high in front of the goal, and Leonardo caught it and shook the net with a powerful right-footed turning shot.
This is the debut goal scored by Leonardo from Brazil, who joined Ulsan after playing in Japan and China, after two matches.
Ulsan overcame a dizzying run-off crisis in the second half.
In the 17th minute of the second half, Seon-Min Moon's shot hit Ilyuchenko and went into the goal, but offside was declared.
After that, Ulsan, who had well blocked Jeonbuk's wave offensive, won 1-0 and returned to the lead with three consecutive wins.
On the other hand, Jeonbuk, which is aiming for the championship for the sixth consecutive year, fell into ninth place after losing a streak.
Military team Kim Cheon defeated Seoul 2-0 and moved up to third place.
National striker Jo Kyu-seong scored two goals with his left foot alone, giving Seoul his first loss of the season.
Jo Kyu-seong took the lead in scoring with three goals in the season.