GOYANG, Gyeonggi Province — Hours before BTS took the stage for its world tour “Arirang,” its first concert in four years, thousands of fans had already gathered outside Goyang Stadium, filling the rainy grounds with anticipation. By early Thursday afternoon, the area surrounding the venue was lined with Army — many dressed in purple rain jackets and holding Army Bomb light sticks — posing for photos in front of a towering world tour poster. Despite the cold drizzle, the mood remained upbeat, wi