Transmigrated into the Adoptive Sister of the Male Lead Who Called Off the Engagement

[Everything from Chapter 77 onward has been rewritten. The official revised edition is now canon. If the revised plot isn't for you, you can treat Chapter 94 as the ending: the two of them get together.] [One-on-one romance, carefree girl × possessive brother] Two years after transmigrating into a book, You Zichun suddenly realizes that her sworn brother, Pei Yihe, is the novel's male lead, a proud hero who breaks off his engagement. Even worse, he might be about to kill her! The reason is simple. The male lead in the book is ruthless and decisive, and prefers to work alone. And she is just an ordinary person, nothing but dead weight to him as he is hunted by his enemies. Although the two of them have relied on each other to survive, You Zichun can't help thinking about Pei Yihe's recent hesitations, the sound of him sharpening his sword late at night, and how even the sword spirit that has been with him since childhood and the magical jade pendant he picked up by chance are secretly urging him to get rid of her, the burden he has to carry... In short, to save her own life, You Zichun decides to run away. Her first escape attempt fails when she runs into Pei Yihe along the way. He doesn't ask why she ran so far. He just grins and says, “That jade really was a treasure. Even broken, it can still fetch a pretty good price. I'll make you some soup when we get back.” You Zichun breaks out in a cold sweat. He destroys his cheat item just like that? This man is terrifying! The second time, she sneaks out in the middle of the night. As for travel expenses, obviously she'll take the marriage contract, disguise herself as a man, pretend to be her brother, and go to the young lady's house to break off the engagement and ask for compensation! But as soon as she arrives at the young lady's house, she's detained. The “young lady” behind the screen smiles and says, “Break off the engagement? Not a chance. The wedding is next month.” You Zichun: ??? I'm doomed! Trapped in this enormous estate, You Zichun spends every day plotting her escape. Then one night, she vaguely smells blood. She cautiously opens her eyes a crack and dimly makes out a lone figure standing beside her bed, holding a bloodstained sword. “Awake?” The voice belongs to Pei Yihe, but it's no longer light and cheerful like before. It's eerily calm. “Who's been fooling you into abandoning your brother this time? Tell me, okay?” [Reader's guide] ✨ One-on-one romance, carefree girl × possessive brother. Low-magic setting. The heroine and hero are not related by blood or by family ties. They have already left their clan when the main story begins, and “brother and sister” are just forms of address. ✨ Includes a falling-out between friends, meaning the hero and the sword spirit. They are friends at first, but later turn against and hate each other. The sword spirit is only a minor supporting character. This is strictly a boy-girl romance, so please don't derail the discussion. ✨ The heroine is an ordinary person, and there's not much plot beyond the romance. A bit of a trashy, melodramatic love story. ✨ Other characters have one-sided crushes on the heroine, nothing more. ✨ The antagonists include both men and women. More details to come. Theme: Persistence leads to victory