"Shall I show you what a demon lord can do?"

The Handmaiden (2016) dir. Park Chan-wook / Revolutionary Girl Utena (1997) ep. 38 "End of the World"

Huntr/x has been doing this gimmick for years where they'll put on a performance and some actors dressed up like demons will "interrupt" it or get into some choreo fights on stage and stuff. If you're a fan you know, the demons usually symbolize things like industry corruption, Mira's struggle with her family, Rumi being in the closet, etc, and there's lots of hints and secret messages to the fans in what they're wearing or how they show up. Check out huntresx5evah on blsky they've got an extensive examination of the "demons" over the years and what the messages to the fans are.

In the concert before Golden was released, the demons were dressed like flight attendants. That was the indication that something new was about to take off. @/queenhuntrixdontmiss and I speculated that it was going to be a new single and low and behold, it was.

But then the live performance got cancelled. It's an open secret that Rumi was having vocal issues, so that was probably not planned. They needed to buy time for her to recover, so, enter the Saja Boys -- a fake band of guys really clearly pretending to be demons, they release ONE single, do a bunch of b-tier variety shows for a week, nearly all of their public appearances have Huntr/x right there, keeping the hype and energy up until Rumi can get her throat polyps removed and furthering the routine where Huntr/x are supposed to be secret demon hunters and the Saja Boys are supposed to be secret demons.

Then the whole thing culminates in the Golden live performance at the idol awards, the big act with Huntr/x fake "break up" and the subsequent theatrics to make it up to fans for failing the first Golden performance. Huntr/x takes their obligation to fans very seriously, I've no doubt that they all felt terrible about having to cancel, so a free show was the obvious recourse to try and make it up to people. And they pulled out all the stops!