Rewritten:
I woke up to find myself as the antagonist in a martial arts novel, but unfortunately, I was just an insignificant extra character who was also the son of the Demon Sect leader. I was a scoundrel, a playboy, with weak combat skills and an unpleasant temper. My character's fate was sealed when the main character killed me off with a single slash in the book.
Now stranded in this world, I had no option but to level up and become stronger to survive. I didn't care about anything else; all I wanted was to destroy everything that came in my way.
This is the story of a villain determined to survive and the harsh reality of martial arts.