BTS is back - but K-pop has changed

Watch: BTS members finish South Korean military service"I missed them so much," says Stephanie Prado, a die-hard BTS fan who has been desperately waiting for the group to reunite after a two-and-a-half-year hiatus.Her love for the boy band inspired her to move from Brazil to South Korea - so it was no surprise that she turned up last Friday for "BTS Festa", a big party held every year near Seoul on the group's…