"France had a difficult time with Korea's strength of spirit. Hiddink has done well."
Korean will face Poland, Portugal and the USA in group D and coach Hiddink admitted there were encouraging signs against France.
"They were surprised in the first half. They got caught by our pressure," he said.
"We attacked in the midfield so they couldn't play their own game.
"It was good to see what the Korean team can do."
But the Dutchman refused to get carried away with his team's chances and said they were still learning.
"I'm not so happy to lose the game but this is a learning process," he said.
"At the end we were a little bit overexcited and didn't get the result.
"But in the last seven games we have improved day-by-day and game-by-game tactically, we have more than eleven good players at a good stage of development.
"Now it is not a matter of a lack of quality, it is a lack of experience.
"We are ranked fourth (by FIFA) in Group D and so we have to be realistic about our goals."