Former Fulham forward Seol Ki-Hyeon scored one goal and created another as Ulsan Horang-I defeated Busan I'Park 3-2 in the final of the Rush & Cash Cup.
Koh Chang-Hyun opened the scoring for Ulsan seven minutes before the break after being found on the edge of the box by Seol.
Seol then extended Ulsan's lead on the stroke of half-time with a well-struck left-footed shot for his first goal of the season from open play.
Kang Jin-Wook's strike just before the hour looked to have sealed the win, but Yang Dong-Hyun scored twice in six minutes for Busan to set up a nervy finish.
"The players performed well," said Ulsan coach Kim Ho-Gon, who celebrated his first trophy.
"It is hard to compete in both the cup and the league and this win will give us confidence to go and improve our league form. It was a tough game and Busan pushed us until the end but I am very happy with the win."