The Tang Dynasty's Live-In Son-in-Law: I Failed to Become a Saint in My Past Life, So Now I'll Be a Demon King

I transmigrate to the Tang Dynasty and become a live-in son-in-law. You say I'm a troublemaker, and you call me useless. Then I'll cause trouble just to show you, and still be better than a worthless thing like you. If being a good person gets me looked down on, then I'll be a bad one. If bad people have ranks, then I'll be evil enough to be a Demon King. When the beauty in my arms smiles, I'll raise my sword and shake the ends of the earth.

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.