My Disciple Always Wants to Turn Over a New Leaf

[A tsundere, ruthless old Demon Lord × a young disciple who yearns to follow the righteous path] Demon Lord Yan Ge is ruthless and unrestrained. It isn't until he's about to retire that he remembers he needs to train a successor. He casually picks up an eighteen-year-old girl with a Yin constitution and plans to pass his mantle on to her. “Chenghuan, when you're hungry, you shoot a bird and eat it,” the Demon Lord instructs her. “But Master, do you eat hundreds of birds when you're hungry?” Yan Ge demonstrates, opening his enormous, blood-red maw. “Chenghuan, when you're short on money, you rob people!” the Demon Lord says again. “Master, we should work hard and get rich lawfully.” So Yan Ge works even harder at robbing people. Demon Lord Yan Ge carefully teaches his disciple the principle of “never neglect an evil deed just because it seems small.” Unfortunately, she is devoted to doing good and utterly incorrigible. One day, Yan Ge is held at someone else's mercy. The girl, who had always been surrounded by countless members of the righteous sects, steps forward. “Lay a hand on him, and you'll answer to the young mistress of the Demon Sect!” In Xu Chenghuan's eyes, her master is no gentleman. But anyone who dares lay a hand on him is truly beyond redemption. After all that effort raising a disciple, Demon Lord Yan Ge finally realizes he hasn't raised a successor at all. He's raised the successor's mother.