The return of BTS is a big deal.

In case you were in any doubt, just look at the frenzy surrounding the South Koreans' comeback.

On Saturday, the band will kick off a sold-out, 82-date world tour with a free concert in Seoul, which is expected to be attended by more than 250,000 in-person fans and will be live-streamed on Netflix to more than 190 countries.

When the tour wraps up in 2027, BTS are expected to have generated more than $1billion in revenue. Some more outlandish estimates suggest they will eclipse the $2billion haul of Taylor Swift's Eras tour.

Even so, demand is so high that Mexico's president, Claudia Sheinbaum, has written to the South Korean government asking for BTS to play more shows in her country.