I Transmigrated into a Cultivation World and Became the Male Lead's Master

[Transmigration + System + Angsty Master-Disciple Romance + Unrequited Love] The female lead is an incredibly powerful expert. The male lead starts out weak, but eventually becomes a heaven-defying powerhouse. Shen Shuyao is a modern-day college student who dies from staying up all night reading a novel. She unexpectedly transmigrates into the book and gets bound to a System that tasks her with saving the male lead. At the System’s insistence, she takes in the pitiful Luo Xinghe as her disciple, hoping to prevent the tragic fate of him falling into demonic ways. Shen Shuyao thinks she has successfully raised the little brat into a righteous, well-behaved student. After completing her mission, she returns to the modern world. … After his master leaves, her disciple refuses to focus on cultivation. All he can think about is bringing her back to life. In the first year after she leaves, he, who has never believed in gods or Buddhas, comes to believe for the first time. He climbs the three thousand steps of Kunlun Mountain, kneeling at every step as he begs the immortals to save his master. The immortal tells him, “This is her fate. I cannot save her.” “Fate? If you can’t save her, then I’ll save her my own way.” He chooses to fall into demonic ways and become the supreme Demon Lord. With boundless magic, he will be able to bring his master back. “Master, when you’re here, the world is beautiful. Without you, none of this deserves to exist. Let it all be destroyed.” Shen Shuyao is forcibly summoned back by the System once more. Seeing that she has led her disciple astray, and that he nearly destroyed the Three Realms, she gets a serious headache. The moment her disciple sees her, he drops to his knees in front of everyone. How embarrassing! She needs help, and fast! Shen Shuyao hopes her disciple will make something of himself. Instead, he dares to confess his love to her. “Master, stop running away. Turn around and look at me. What is it about me that you don’t like? I’ll change, all right? Master, could you love me, even just a little?”