I think because once the scenario started they stopped being just humans. They became incarnations of different constellations. Not to mention Kim Dokja who became a constelation himself, thus his constellation body was made out of his core stories, those that made him who he is and mad ehis character
I agree, even when Kim was in the demonic world, his bodies needed story and I really didnt understand at that point even tho I tried to ignore "stories" when it was introduced (since I didn't get it)
It's like without your story, you cease to exist in that world. That's why stories are very crucial.
minor spoilers
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I finished the novel long ago but there's one thing I still don't understand. In this one chapter they're curing people with STORIES. Living, breathing humans with blood in their veins (i guess??) are getting stuffed a bunch of stories into their body as medical treatment. I know they're trying to tell us that everything is a story and all but I always found it confusing how fables are treated like an object or something and I'm really curious how they'll draw those parts.