Beat is from a 15yo updated sample of m-flo / prism. They're kind of a Japanese version of Daft Punk. You should check out their XTRA XTRA Doc where they show the bts 5y training process.
Fandom is called ALPHAZ because the leader of a pack of wolves is called the Alpha. They have a Wolves/Alien concept. XG- Say My Name (Destiny's Child). Chisa- I Have Nothing (Whitney Houston). Hinata- Take Me Away (Keyshia Cole). Juria- Without You (Mariah Carey).
As dope as the video is I really want to see the dance video, their last drop SAR is the envy of professional dancers around the world. You're in for a treat when you get into the Vox series, they're bringing the R&B vibe back into mainstream and making it their own. Sample song on this beat is Prism by M-flo which was already dope.