Mostly unserious kpop demon hunters theory:
The demons are a metaphor for being trans
Think of the plot, it's all about letting people know what you are inside!! Rumi is desperate to pass as a woman, she refuses to go to the bathhouse lest her friends realise she isn't cis!!!!
She is terrified of being seen until the day her patterns (surgery scars) fade!!! And then at the end she sings "the scars are part of me", accepting who she is!!! "My voice without the lies" she's coming out of hiding, "rising defiant" despite knowing the scorn she is likely to face.
The scene where Jinu and Rumi start to trust each other and have hope for change, the song is all about being "Free", the freedom to live as who they truly are. THAT'S SO TRANS CODED?????
Gwi Ma gives people the power (gender) they truly desire, in exchange for losing their place in society (because people are transphobic). But then at the end they prove that demons can be loved, not just by other demons (trans people) but by humans (cishets) too!!!
The climax scene has blue and pink lighting, while the girls wear white. That's the trans flag.
the Saja Boys fandom is called the pride. 🏳️🌈🏳️🌈🏳️🌈.
All the Saja Boys have bad posture except Jinu. Why? Because they're used to hunching to hide their chests before they got surgery.
The movie was released in Pride month!!!! Nothing in this movie was a mistake or incidental, so why would the release date be??
This is 90% a joke theory so don't read into what this means for demons being evil and eating souls. Please do not start attacking me either.