Busan was awash in BTS fever on Friday, on the eve of the group’s 13th debut anniversary, as fans from all over the world gathered, and themed displays — including a blimp and buses wrapped with members' pictures — marked the opening of the group's two-day concert. Ahead of BTS' two-concert "Arirang" world tour stop at Busan Asiad Main Stadium, the group said it was "very happy" to reunite with its fans, known collectively as Army, in Korea. "We are so happy to be able to enjoy this special day