BTS’ fifth full-length album “Arirang” is breaking K-pop records, topping the Billboard 200 while its lead track “Swim” simultaneously claims the No. 1 spot on the Hot 100. Thirteen of the album’s 14 tracks — including “Swim” — have also entered the Hot 100, marking an unprecedented feat for a K-pop release. Beyond the numbers, industry observers say the album’s success reflects a carefully constructed strategy that signals a new phase not only for BTS, but also for K-pop’s global expansion. At