The Female Lead Was Raised All Wrong, and Now I Can't Keep the Rebellious One from Turning the Tables on Me

What should I do when the female lead I raised myself turns into a crazy, possessive yandere? I transmigrated into a book with the task of raising the female lead. To keep her from stabbing me in the back, I diligently taught her the right values. I also agreed to get back together with the female antagonist who loved me. But after the female lead took her college entrance exams, she confessed to me in front of my wife. "Brother, you don't have to keep pretending. I knew a long time ago that I'm not your real sister." "I'll repay you for raising me. But I won't allow you to marry her." She looked at my wife, the female antagonist, as if she were already dead. Then she turned to me, smiling with obsessive madness. "Brother, from...