Ki Sung-yong's 23rd-minute penalty put the Koreans ahead before Ryoichi Maeda levelled nine minutes before half-time.

Neither side were able to add a second before the end of 90 minutes, taking the game to extra time. Hajime Hosogai's 97th-minute goal put the Japanese ahead only for Hwang Jae-won to strike with seconds remaining to force penalties.

Keisuke Honda, Shinji Okazaki and Yasuyuki Konno all scored from their spot-kicks while South Korea failed to convert theirs to send Japan through to the final.

The match threw together two of the best teams in Asia and unsurprisingly it was an open contest from the outset.

Okazaki headed wide after nine minutes before going closer in the 18th minute when his downward headed was pushed onto the post by South Korea goalkeeper Jung Sung-ryong.

But it was the Koreans who drew first blood five minutes later. Yasuyuki Konno fouled Park Ji-sung inside the area and Ki stepped up to send the spot-kick to Eiji Kawashima's left.

It was the third time in five games that Japan have conceded first at the tournament but on both previous occasions they successfully battled back and once again drew level nine minutes before the break.

Honda's fine pass sent Yuto Nagamoto through to run into the box before the defender cut a pass back to Maeda, who was waiting in the middle of the area, and the forward made no mistake to fire beyond Jung.

After a superb first half it was expected that the second would continue in the same vein but chances were largely at a premium.

Koo Ja-cheol had a good chance for the Koreans when he burst past two defenders after being picked out by Ji Dong-won, but his shot went into the side-netting.

Lee Yong-rae curled a 71st-minute free-kick just wide before Okazaki twice had half chances, but the two sides could not be separated before the whistle, meaning extra time was needed.

Japan had looked second best to the Koreans for much of the second half but it was they who took the lead in the 97th minute. Okazaki was pushed just inside the area by Hwang Jae-won and, although Okazaki's penalty was saved by Jung, Hosogai pounced to smash home the loose ball.

The South Koreans pressed for an equaliser but it seemed Japan had done enough to secure the victory before Hwang capitalised on a goalmouth scramble to sweep home and take the game to penalties.

Kawashima then made two saves for Japan and Hong Jeong-ho sent his spot-kick wide before Konno successfully converted Japan's third penalty to send them through to the final.