The Frail Immortal Lord Is the Villain [Quick Transmigration]

Bai Yulou was the ultimate big boss in the cultivation world, but one careless move got him sealed away in a secret realm beyond the heavens by the protagonist. After three thousand years, the Heavenly Dao could barely keep him contained anymore. In a panic, it contacted the quick transmigration bureau and asked them to hurry up and get him out of there. The next day, a rookie System blundered into the secret realm and saw a man in white standing beneath a tree. His ink-black hair fell like a waterfall, his lips were pale, and his frame was exceptionally frail. When he lifted his eyes during a quiet cough, he looked just like an immortal in a painting. Then he smiled and wiped out the sect that had dared to bully his disciple. System: ...???!!! - Xue Qingyan was the heroine of a cultivation novel, the beloved junior sister of her sect, with an immortal revered as a nominal master. But on the day she formed her golden core, the sect leader locked her in a secret chamber. It turned out that her blood and flesh could be consumed as a sacred medicine for cultivation. She hated them. In a single moment, she became a demon. She concealed demonic energy within herself and quietly waited for the day those hypocrites would be completely corrupted. - Then one day, without anyone realizing it, everyone's memories were replaced. No one noticed that their sect's immortal had become someone else. Footsteps sounded outside the secret chamber. Xue Qingyan slowly raised her head and looked over, meeting a face that was both familiar and strange. She hesitated, then spoke: "...Master?" Bai Yulou looked at the young girl whose fate resembled his own from years ago. His gaze deepened, then he suddenly smiled and replied, "I'm here." From that day on, Bai Yulou would be Xue Qingyan's master, and hers alone. [Master-disciple story, frail villain vs. corrupted heroine] Theme: Cherish life and treasure those who love you.