It’s always fun to see Korean groups like BTS, Blackpink and Day6 being interviewed on American talk shows. But it’s also eye-opening to see international acts having fun on South Korean programs, whether it’s Tom Cruise appearing on “Running Man” or NBA star Stephen Curry on “Infinite Challenge.” But one of the most charming segments I’ve seen in a long time is 5 Seconds of Summer’s guest appearance on “YO~! WELCOME TO KOREA!”