FC Seoul needed a penalty shoot-out to progress while a goal from Korea Republic striker Lee Chun-soo was enough to earn Ulsan a 1-0 win over the former Asian champions.

Lee Sang-yeop struck from 25 yards out to give FC Seoul the lead in their semi-final after 20 minutes only for Kim Sang-rok to silence the home fans just moments later with the equaliser.

From that point, chances were few and far between and the game drifted into extra-time and then penalties.

Seoul goalkeeper Kim Byung-ji saved Lee Dong-won's spot kick to give the hosts a 4-3 win.

Seoul will meet Ulsan next Wednesday after the Tigers downed the in-form Bluewings at Munsu World Cup Stadium.

After a goalless first half, Lee struck with one of his trademark free-kicks, which curled past national team-mate Lee Woon-jae in the Suwon goal two minutes before the hour mark.