How the Villain Invests in the Female Lead

A mere young man lived in a mere world. He was called by a name: a Heartless Monster, after all he had done to his girlfriend. He played with her love like a toy, or merely suppressing a monster within his heart – Lustblood. He died after being run over by Truck-kun. He reincarnated into the body of a trash noble from a powerful family, yet this new life had already left behind many troubles for him to deal with. One day, he got a wife – the king of knights with immense potential, yet she was crippled. A cheat appeared. He simply restored her; countless skills and her art manuals would belong to him. But there was one problem. The damned system was designed to turn him into a good man, a perfect husband. Whether he would accept it and follow the system’s requests or not? He would do what he was meant to do – [a villain.] Author Note: Anyone who enjoys legends about King Arthur should read this novel. Furthermore, I am a full-time author, so you don't need to worry about regular chapter updates. — Description from novelcodex.org