Ibrahim al-Hamidi, 13, from Syria's restive southern city of Daraa, said taekwondo "is teaching us good manners, while making us stronger."
"It's also good for our bodies and muscles and it teaches how to defend ourselves," he said.
Ali Badran, 13, also from Daraa, said: "Taekwondo is amazing."
"Once I go back to Syria, I want to start teaching Syrian students," he said.
For now, the taekwondo training is limited to boys, but will include girls at a later stage. The Koreans are also training 10 adult refugees mostly former soccer coaches to give the classes when they leave.
Without school, the children "no longer have any system in their life anymore," said Mohamed Rashid, one of the Syrian coaches. "But we've found that an exercise routine which can change children. Maybe even more than schools, because they actually enjoy it."
He said he sees the effect. The boys deal better with their friends, for example. "In one month, their bodies have changed a lot. And they are also more in control of their minds."
Here's a gallery of images from the classes in Zaatari camp.
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Associated Press writer Jamal Halaby in Amman, Jordan, contributed to this report.