One in five South Koreans in their twenties have purchased a form of digital currency. : SEOUL, March 6 (UPI) -- South Korean millennials appear to be the driving force behind the country's cryptocurrency craze, with one in five people their twenties having purchased a form of digital currency. Korea Financial Investors Protection Foundation said 14 percent of some 2,530 South Korean adults surveyed in December said they have experience of buying cryptocurrency. Based on the count of 27.5 million working South Koreans by the end of last year, the 14 percent would amount to roughly 3.8 million people.