Matcha's feed

I'm on ch.2 and it's weird how he seemed to not know anything about his own novel. Also, he knew that the character he's possessing is gonna be assassinated and yet he didn't know how he survived. Surely, if he's the main villain, he should have survived, right? I mean, if the guy is not yet that strong, it means its just the start of the story. Don't tell me he didn't write anything about the main villain except for the basic background info? Lol.