K-pop — more formally known as Korean popular music — as we know it has been around since the ’90s, but its popularity was mostly confined to South Korea and Japan. However, about a decade ago, a certain K-pop music video went viral on YouTube and soon everyone from astronauts to U.N. secretary generals were doing the horse dance and shouting, “Oppa Gangnam Style!” K-pop is huge but only a small handful of hopefuls become idols. Those who make it big, however, earn more than enough to live the high life in Seoul’s prestigious Gangnam District. Here are the 20 richest K-pop stars according to their net worth as estimated by SeoulSpace. All figures are given in U.S. dollars.