The son of Cha Bum-Kun, regarded as one of Asia's best players of all time, said the 2-1 defeat by Uruguay was devastating after they controlled much of the game in the second half.
"We were controlling the game, we had played a great second half and then to lose like this... that hurts twice as much," he told Reuters, with tears still welling up in his eyes.
"They had two world-class attackers, that paid off today. In football you also need some luck. That's what we were missing today," he said.
"We were so close, it's sad, makes you bitter," the 32-year-old said, trying to control his emotions.
"I'm not the youngest anymore either and who knows if I get to play in another World Cup. That makes it all the sadder."
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