I Saved the Beautiful Male Lead of a Danmei Novel

The male and female leads are not blood-related. Before the female lead's parents died, they entrusted her to the male lead, who was also an orphan. He never adopted her, and they were never siblings. She called him "big brother" growing up only because he was a few years older. This is a story I'm writing for myself. Please proceed at your own risk, and don't read it if it's not your thing. [Blurb] Yun Shuang stayed up all night reading a novel and died suddenly. When she opened her eyes, she found herself in an antique-looking room. A beautiful young man with snow-white skin sat beside her bed, holding a bowl of medicine and gazing at her with deep worry. Yun Shuang tried to talk to him, only to realize he couldn't speak. He answered her in sign language she couldn't understand. Before long, unfamiliar memories came flooding into her mind. Only then did she realize she had transmigrated into the novel she'd just been reading, an old-fashioned danmei story featuring a substitute, coercive possession, and tragic romance. The person before her was the pitiable mute uke from the novel, her "big brother," Yun Qi. To raise money for his little sister's medical treatment, Yun Qi would sell himself to a brothel and perform there. While making his debut, he would run into the novel's other male lead, the powerful heir to the Prince of An's household. Because Yun Qi resembled the heir's unattainable beloved, the heir would use his power to threaten him, using his sister's life as leverage to force him into the manor, where he would suffer until both body and mind were broken. In the original novel, the male lead's younger sister, Yun Shuang, was an irredeemable villain. She was in love with the heir and jealous of her brother, framing him time and again and even trying to kill him and take his place. But after the transmigrated Yun Shuang sorted out the plot, she looked at her big brother, whose heart and eyes held only her, and felt her protectiveness surge. She swore she would never let him be humiliated. The bad news: the heir had already noticed her brother. The good news: the heir hadn't yet started scheming to force him into the manor. So she discussed it with her brother: Run away. Right now! Her brother took her advice to heart. That very day, he packed their things and fled the brothel with her. Ever since they began their escape, Yun Shuang felt as if fortune were on her side. The people sent by Prince An's faction to pursue them kept dying in front of them due to all sorts of accidents. Once they were out of danger, her brother even gradually regained the ability to speak. Everything seemed to be going well. Yet when Yun Shuang saw her brother leaving early and returning late, often with the smell of blood clinging to him, she sensed something strange that she couldn't quite explain. Later, Yun Shuang followed her brother to Prince An's manor in the dead of night. Hidden beneath a pillar, she watched helplessly as he drove a long saber through the heir's heart, then set the manor ablaze. Only then did Yun Shuang realize the truth. Yun Qi had been reborn long ago. The sweet, innocent young man from before had turned dark through and through. He had a little notebook listing everyone who had humiliated him in his previous life. He tracked them down one by one, torturing them mercilessly and leaving them with gruesome fates. At the very end of the notebook was Yun Shuang's name. Yun Shuang was terrified. She remembered all the terrible things she had done to him in the book. Who knew when Yun Qi might take revenge on her? So, while Yun Qi was away one day, Yun Shuang hastily gathered up the money and ran off without leaving him a thing. But one day after her escape, someone ambushed her and knocked her out with a drugged incense. When she awoke, Yun Shuang found herself back in the little courtyard where she had once lived with Yun Qi. Red curtains hung all around the side room, making it look like a bridal chamber. That man clutched her in his arms like a madman and lowered his head to kiss her lips. "A Shuang, didn't you say you'd marry your big brother once they were all dead? Why did you run away?" Yun Shuang: ...When did I ever say that? Yun Qi had once fallen into the depths of hell. It was Yun Shuang who took his hand and led him, step by step, back to the human world. His little sister was a precious treasure in the palm of his hand, his only salvation. Reborn into a new life, he would do anything to keep Yun Shuang by his side. But he couldn't understand. He had been careful enough, so why was his little sister afraid of him? The male lead is reborn. In his previous life, he was a kind and naive, delicate flower. After being abused and reborn, he turns dark and unhinged. The female lead was born into this life and then reborn. She was also the one who relied on the male lead as a child, but she has forgotten her memories of her previous life. Both leads are virgins. Several people have one-sided crushes on the female lead. The male lead has a speech disorder, but recovers later. It's a story about someone who thinks she's rescuing a courtesan, only to rescue an unhinged man and then be forcibly taken by him. Theme: Love life