After I Transmigrated Into a Book as Cannon Fodder, I Got a Yandere Villain Fiancé

After transmigrating into a book, Lin Ruru becomes Zhou Nianci, the female lead's cannon-fodder older sister. Her marriage is given to the female lead, her spiritual roots are exchanged for the female lead's, and in the end, weakened by the loss of her spiritual roots, she dies in a pool of blood. Lin Ruru doesn't want to be this cannon-fodder supporting actress for another day, so she decisively leaves the Zhou family. Then she discovers that her biological father is actually the Demon King, and that she also has a young cultivator fiancé training at a sect. When the Demon King arranged their betrothal, he swore an oath. If he failed to fulfill it, he would suffer Heaven's wrath. Faced with the throne her Demon King father is offering her, Lin Ruru, who just wants to lie flat, has no choice but to find her fiancé. She plans to marry the young cultivator, fulfill the oath, and then divorce him. She joins Wuji Sect and finds the young cultivator who will one day become a grandmaster. Lin Ruru happily prepares for the wedding, only to discover she's mistaken him for someone else!!! Her real fiancé is the villainous grand-uncle of the sect, who is about to turn demonic and go dark! Lin Ruru: Is it too late to run now? The villainous grand-uncle pins her in a corner, his gaze sinister. “My lady, you won't escape my grasp.” Lin Ruru lowers her eyes demurely, a bashful smile on her face. “I'm my husband's wife. I adore you, so why would I want to run?” After relieving her Demon King father of the threat of Heaven's wrath, Lin Ruru runs away. The villainous grand-uncle completely loses himself to darkness. The female lead, who has the script of the protagonist in her hands: This plot is getting more and more ridiculously off track. The world says that Yun Mengze, the grand-uncle of Wuji Sect, murdered his master and brother and is burdened with heinous sins. Yet his cultivation is so powerful that no one in the cultivation world can rival him. The world doesn't know that he was trapped in a dark cage for over a hundred years, with nothing at all, until a little girl brought him light.