Let me know if I missed anything!
I've seen Girls of Paper and Fire by Natasha Ngan on other lists before! Girls of Paper and Fire is a lot darker than Kpop Demon Hunters, but the line "So we're not heroes, we're still survivors" matched pretty well with my interpretation of the book's vibes.
Good call! Added!
how about Shine and Bright which were authored by ex k-pop legend Jessica Jung? it's missing the fantasy element but reads like a k-drama centered on the k-pop world
also i've not read it yet but maybe Song of Silver, Flame Like Night by Amélie Wen Zhao matches the vibe?
Also added Song of Silver, Flame Like Night!
Added Shine and Bright!