After I Transmigrate into a Book, I Become the Crazy Villain's Little Sun

[Healing little-sunshine heroine × crazy but deceptively sweet male lead] After transmigrating into a cultivation novel, Yun Zhao is bound to a System. Her mission is to win over the villain, Qi Yan. Qi Yan is deranged and sinister. He murdered his father and brother and committed every manner of evil. In the future, he will wipe out the protagonists and cause the world of the book to collapse. On her first day after transmigrating into the book, Yun Zhao looks at the man on the high platform, as refreshing and bright as a breeze beneath the moon. Yun Zhao: “That’s the villain?” Only after the System explains does she learn that Qi Yan and the male lead share a father and look alike. He is the male lead’s shadow, condemned to live forever beyond the light. While the male lead stands on the platform, Qi Yan is locked away in a lightless dungeon, doomed to spend his life in darkness. Qi Yan carries the blood of the demon race and has endured countless abuses. Reborn, he resolutely chooses the demonic path, intent on killing his enemies with his own hands. The dungeon is bleak and gloomy. Then a little sun falls from the sky and crashes into him, forcing his demonic transformation to stop and driving away the darkness. A ray of sunlight shines in. Qi Yan looks up and sees a smiling young woman turn back toward him against the light. “I heard you wanted some light?” “You won’t have to ask for light anymore, because your light is here!” To keep Qi Yan from turning demonic, Yun Zhao does everything she can to guide him onto the right path. When Qi Yan is injured, she gives him medicine. When he goes on an adventure, she watches his back. When he’s drugged... well, she wouldn’t be against it. Qi Yan thinks Yun Zhao is just teasing him, but after it happens again and again, his heart fills with sweetness. “Zhaozhao loves me. I’m in her heart.” He has a sun of his own now, too. Once her mission is complete, Yun Zhao takes her reward and fakes her death to return home, only for the System to urgently summon her back for aftercare. As soon as Yun Zhao arrives, a certain person who has gone dark pulls her into his arms. “Didn’t you say you’d be my light?” “I’ll do whatever you say. You can even touch my tail. Just don’t leave me...”