Seoul, South Korea–The world’s biggest boy band BTS reunites Saturday for an open-air comeback concert in the heart of Seoul, expected to draw around 250,000 people and beamed live across the globe.

BTS saved me when my mother, who was my entire life, passed away.” For Yuna Sernelss, 25, a Belgian national, BTS songs hold a meaning beyond music. Two years after her mother’s death, she endured by ...