I Impersonated the Novel's Ancestor

He finds himself inside a fantasy novel, in the secluded cave abode where the Heavenly Demon Ancestor is meditating in seclusion.

By chance, the Ancestor dies, so he decides to impersonate him.

But the original plot of the novel goes like this:

A mouthful of blood, and there's a dumbass like this...

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.