Swansea City midfielder Ki Sung-yueng says taking part in military service in South Korea was "tough" but "a great experience."
South Koreans must complete two years' compulsory military service before the age of 29 or face being exiled.
Ki, 27, only had to complete four weeks service after being part of the team which won men's football bronze at the 2012 Olympics.
"I was treated like a soldier and there was no time to think about football," Ki said.
"The training was not hard but mentally it was a little bit tough because I needed to stay there for four weeks.