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Ulsan, which is trying to relieve the pain of being runner-up in the K-League for three consecutive years, reported its first win in two games.
Jun Amano, a former Japanese national team player, scored two goals and led the victory.
Correspondent Lee Jeong-chan.
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Ulsan, which drew without a goal in the opening match against Sangmu Kim, did not score the first goal of the season until the second half of the second match.
In the first minute of the second half, Seol Young-woo's ball flowed backwards, and Amano Jun opened the scoring with a left-footed volley shot.
This is Amano's debut goal, who transferred from the J-League Yokohama from the Japanese national team.
After that, Amano managed to score two penalty kicks to break through the offensive line.
Barco's penalty was saved, but Amano took his second chance as the kicker and calmed it down.
Ulsan, led by Amano's two goals, defeated Seongnam 2-0, with 1 win, 1 draw, and tied for second place.
Suwon Samsung won their first win of the season by defeating local rival Suwon FC with Park Hyung-jin's winning goal.
Suwon FC did not follow the goal luck, such as Lee Seung-woo's decisive shot hitting the goalkeeper's face, and they lost their opening two consecutive losses.
Seoul drew 1-1 with Incheon.
It was led by captain Ki Seong-yong's own goal, but in the second half, Kim Jin-ya's equalizer goal escaped defeat.
(Video editing: Woo-Jeong Woo)