After the Villain Was Mistaken for the Protagonist by His Master

Duan Wangyue was a half-human, half-demon hybrid. His birth killed his mother, and his maternal family considered him a monster because of the horns on his head and the tail behind him. Though he had the title of young master, he was treated worse than the household servants. Everyone in the vast Duan manor could take a kick at him. So, when Duan Wangyue was five, he set fire to the place and burned down the home that held all his painful memories. It was because of that fire that he met his master, Xiao Yuan, who was traveling through the mortal world. His master doted on him, protected him, and taught him magic. Duan Wangyue treasured the only person in the world who had ever treated him well. His master, who had treated him so well and said he would only ever take him as a disciple, took on another disciple. The master's special affection, which Duan Wangyue had once enjoyed alone, now had to be shared with someone else. Duan Wangyue thought: If moonlight only stays for a moment before leaving, then I'll drag the moon down and keep it by my side forever. If the moonlight was never mine to begin with, then... I'll take it. * Xiao Yuan transmigrated into a book, a cultivation novel he'd read years ago and had almost forgotten. He only remembered a cannon-fodder master who shared his name and surname, and who was eventually turned into a skeleton by his disciple after abusing him. In the end, the disciple went mad and wanted to destroy the world. The System said that if he could make the villain turn wholeheartedly toward good and reach a peaceful ending for the world, he could go home. After telling him where to find the disciple, it shut down. After bringing his disciple back to the sect, he taught him with great care and kept a close eye on him to make sure he didn't go astray. Then, when the disciple turned sixteen, the System recharged and came back online. Seeing the adorable disciple who was wholeheartedly devoted to good, it issued a shrill warning: He had picked up the wrong disciple. There was nothing for it. Xiao Yuan had to take on another disciple and teach him just as carefully. It wasn't until Duan Wangyue held him by the chin and pinned him to the dragon bed in the Demon Court that Xiao Yuan realized he'd raised both his disciples wrong. One wanted to destroy heaven and earth. The other wanted to get him pregnant with a dragon egg. Theme: Don't litter