Rapper Psy during his stint in the military Psy made his quirky debut in South Korea's K-pop industry back in 2001 but it wasn't until July that he began shooting to global fame with "Gangnam Style" -- now the most-watched video of all time on YouTube. Psy, whose real name is Park Jae-Sang, completed his two-year military service in July 2009. It was his second time around, as he was forced to repeat after it was revealed he had continued with his showbiz interests during his first two-year stint. File images filmed in 2008 while he was on compulsory military service.