Yoon found the into the lower right corner of the net during injury time of the first added period after South Korea had largely dominated Saturday's match. His team will now play Japan in Tuesday's semifinals.

South Korea and Iran have met five consecutive times in Asian Cup quarterfinals, with South Korea winning three of those matches. Four years ago, it beat Iran on penalties.

After winning the first two editions of the continental tournament, South Korea was runner-up three times and finished third another three times, but has not won the title since 1960.

Iran, a three-time champion with no title since 1976, played a patient game and did not start threatening until about an hour into the match, while South Korea tried to attack from the start.

In the second period of extra time, Iran tried desperately to find space but South Korea crowded its defense and hung on to win.

South Korea had the first dangerous shot at goal in the 24th, when Lee Yong-rae hit a volley from the edge of the penalty box that flew just over the crossbar.

On the other side, South Korean goalkeeper Jung Sungryong was tested by his own forward Ji Dong-won, whose attempt to clear a cross from Mohammad Reza Khalatbari forced Jung to dive to his left and palm the ball away.

South Korea began to apply more pressure about half an hour into the match and Park Ji-sung did a good give-and-take with Lee Chung-yong but could not get off a shot as the ball rolled away.

Ji had a good effort in the right direction in the final minute of the first half, but his twisting shot from the edge of the penalty area swerved wide of the post.

South Korea had more possession and outshot Iran 6-1, but neither team had a shot on target.

The pattern didn't change after the break and Park tied several Iran defenders but again could not get off a shot or send a pass.

South Korea finally found the target when Ji rose to meet a high cross from Du Ri-cha, but Mahdi Rahmati caught the ball without problems.

Iran began getting into the match more after an hour and a huge melee in front of the South Korean goal produced no score as Khalatbari was thwarted several times.

Iran defender Ehsan Haji Safi nearly broke the deadlock in the 71st, but drove his shot just wide. Then another defender, Hadi Aghili, connected with a header that also went wide.

Javad Nekonam's free kick from 18 meters (yards) sailed wide as Iran began to threaten late in the match.

Haji Safi made a sliding tackle to deny Park a shot early in extra time.

Masoud Shoajei lifted a shot from 18 meters (yards) out with six minutes remaining in extra time but hit the top of the net.