Waste Material Against Heaven: the Strongest Princess

She, the mercenary king of the 21st century, was betrayed and killed by her best friend during a mission, but she was transformed into the nymphomaniac and good-for-nothing lady in the general's palace. Damn it, the prince regretted his marriage, slipped and fell into the pond, which turned her into her. He, the surnamed prince of the empire, was taboo even to the emperor. He was cold, evil, powerful and domineering, but he was extremely fond of her. Useless materials, jokes, and a needle in your hand will prevent you from seeing the beauty of the world. She repays those who harm her a hundredfold, and protects those who love her with her life. Let's see how they join forces and dominate the world!