Throne of the Ghost Emperor (Danny Phantom X Naruto) - Chapter 80 - 28

The Mad Cultivator follows the tale of Ye Kong, a rude and vulgar thug from modern day China. While collecting protection fees, he was sent to another world! By the time he realized what was going on, he was possessing the body of an idiot. Watch as Ye Kong struggles against fate to climb the road to immortality!

- Description from Novelupdates

Waking up, Kim Hajin finds himself in a familiar world but an unfamiliar body.

I was thrown into a novel that hasn’t even been completed yet (and turned into a girl…), guided by the omnipresent voice of the unreasonable, amateur Author as he writes the web novel. I have no idea what’s going on, so I have to stick close to the main character to make sure I don’t hit a bad end…Why are you treating only me like this!I’m not suspicious, believe me.I’m a harmless person.“A villain? Not at all.”

This novel is about the young master of the Du clan, Du Shaofu, who was born with crippled veins and is unable to cultivate martial arts . After finding out about his situation from the clan while returning home he got hit by a lightning and a mysterious ‘first scripture’ appears and after studying for ten years he was able to mend his crippled veins together and starts his journey to glory.