Does everything they do have to be perfect?? Why can't we appreciate that they very obviously tried their best? Barely any manhwas include disorders. (other than psychopathy or depression because they're super popular.) This manhwa is about romance, not about the disorder itself, so no wonder the author didn't dive into every single detail about D.I.D, they could understand it's more complex but why overcomplicate it when it's not the main plot?? They just showed the surface of D.I.D, which is reasonable considering how much excess effort it would require to go deeper into the disorder.
This "Vague Dream" person made it so I can't respond to their arguments, so here's my lest response to whatever they're on about:
Not an accusation, just the plain truth: Saying that someone should be okay with their disorders being misrepresented and romanticized in a piece of media just because "the author tried" is sadly ableist. It seems this is just a moment of misjudgement from you and I hope you understand why it's bad to say people with disabilities should accept things like this.
If you don't have a disorder/disability that's being talked about by people that do have it, you either listen and agree or disagree in a polite manner after trying to actually understand the issue, or you keep quiet. Good luck y'all
I didn't reply because I didn't want to argue, that hard to undertsand such simplicity? I didn't say not to critique at all, I said to appreciate the small amount of what was provided. I accepted the authors viewpoint being abliest, why I didn't reply is because the op was being passive aggressive to me and throwing accusations at me without explaining so what did you want me to do? You're the only immature one.

Wish authors properly researched the disorders they add to their stories beforehand
DID and other dissociative disorders don't really work like this, it's so much more complex..
I know every system's experience is different but I've never met someone that has experienced plurality in the way this ML does like, author went full on Jekyll and Hyde with a little sprinkle of real info about the disorder thrown in there, even referencing the book twice? Jekyll and Hyde is the worst thing you could use to represent systems high-key
(Saying all this as a fellow system)