I do believe you may be confusing the outlooks and perspective of the main character, a fictional human being, with the opinion of the author. I don't think that the way the main character acts and thinks reflects on the author. Example: because sangwoo is crazy does not mean that the author is a crazy piece of shit too. The way the mc looks down on others is only natural because he's formed to have an ignorant personality. I believe with character development and progression with the story, we'll see changes.
Yeah and living with strangers with mental health issues (the type that requires a sanitorium) does make the average person feel on edge. It's easy to be tolerant when it isn't affecting you.
I feel like this is a really cheesy version of a "mental hospital" I also feel like this is a kick in the face to anyone with mental problems considering the mc looks down on all the others and acts like all they are is crazy people with mental health problems they are still human too, that aside the way this is set up bothers me a little but I'm intrigued as to who this pink haired dude is and what his story is but I really hope the author humanizes these people for who they really are and doesn't just make them "crazy" and "psycho" mental health patients because there really is more to just someones diagnosis.