K-pop supergroup BTS launched its long-awaited comeback concert at Gwanghwamun Square, Saturday evening, transforming one of the capital’s most historic landmarks into a rare open-air pop stage. Roars from hundreds of thousands of fans filled central Seoul as the concert started. The performance, titled “BTS COMEBACK LIVE: ARIRANG,” marks the group’s first full-member concert in three years and five months and comes a day after the release of its fifth studio album, “ARIRANG.” The single-night show unfolded against the illuminated façade of Gwanghwamun Gate, where large-scale projection mapping and synchronized lighting effects turned the landmark into a beaming concert backdrop, seen through the picture frame-like stage structure. Staging the comeback at one of Seoul’s most symbolically charged public spaces underscores themes of the group's identity, origin and renewal that run through the new record. The group began with “Body to Body,” from its new album "ARIRANG," released Friday. The track is among the most talked-about songs on the album for as part of it contain