K-pop supergroup BTS said Thursday it is determined to deliver a fresh stage experience as it kicks off its first world tour after returning from a nearly four-year break for military service. The new tour, titled "Arirang," opens at 7 p.m. at Goyang Stadium in the city just northwest of Seoul, in what is expected to be the largest concert series in K-pop history. The three-night run marks the start of 85 shows across 34 cities worldwide, including Tokyo, Los Angeles, Munich, Paris, Toronto,