All I'm going to say about BTS is when they finally tour in 2026 they'll prove why they're the only truly global group in kpop. They very well could just do 60 dates in Japan & the US (their biggest markets) and forget about the rest of the world, they'd get 3m attendance from just that after all, but they won't do that because they have global demand and they can tour anywhere in the world and still sell out stadiums comfortably, they're not restricted to just a few markets
I think their booking of that UK stadium, Twickenham Stadium, where Beyonce just performed recently when they were barely seven years old is so impressive because they must have done so much market research for their base in the UK after Wembley in 2019 to tackle that beast. Don't discount their UK base either. It's grown exponentially since Dynamite!