In the end Brazil won at a canter as Romulo and Leandro Damiao fired the Samba Boys into the Gold Medal final match against Mexico on Saturday but South Korea could well have a legitimate refereeing complaint.
At 1-0, just after half-time, South Korea began to press for a way back into the game having been unlucky not to go into the break level.
The ball was threaded down the left hand side for Bo-Kyung Kim to take control of in the box but Spurs midfielder Sandro came in and felled the South Korean.
It looked pretty clear and could well have changed the game.
Referee Pavel Kralovec waved play on.
Decide for yourself on the video below.