Hate of the Ghoul Sister

A cold-faced, cute, gravity-type younger brother x a brash, obnoxious, bad-girl older sister The older sister hated her younger brother from the time he was little. She hated him, so she targeted him at every turn. Unfortunately, she never managed to kill him. In elementary school, he obeyed her, and she still bullied him. In middle school, he did everything he could to get away from her, only to find that school life without her was even more messed up than life with her. In eighth grade, he was bullied by a group and made the target of everyone's hostility. So he turned himself into a bully, making sure nobody dared mess with him. But then his sister showed up and stood up for him. It wasn't the first time she'd done that. She caused him misery, then played his savior. At first, he called his feelings for his sister hatred. Later, she led him around by the nose, and he became like a dog she kept. He hated that she treated him that way, while she hated him for stealing their mother's attention. He resented that she couldn't love him properly, while she resented him for joining the family. So he made her resentment and hatred his sustenance, little by little devouring the malice she felt toward him. If she ignored him, he would be considerate and cruel just to make her notice him. If she hated him, he would take her hatred as love, since it was better than being ignored. If she had a boyfriend, he would stoop low enough to wish her relationship would fall apart. Blurb 2: When Mom found a new boyfriend and brought his son, Chen Jinshu, in front of Bai Yanxi, telling her to call him her little brother, she knew he had come to steal Mom's love, her allowance, her toys, her room, and her favorite foods. He had come to ruin her life. Bai Yanxi wanted Mom to look only at her, but she didn't. Mom gave her whole heart to her little brother, so Bai Yanxi turned her hatred into food that tasted bitter and violent. Tips: 1. Neither lead is a paragon of virtue. Please be mindful of your boundaries. 2. The female lead is not a virgin, and she dated the second male lead. The male lead eventually takes his place. 3. The leads are not related by blood, they are not on the same household register, and they do not cross the line while they are considered family. 4. More may be added later. Theme: To lose and gain, to suffer and be happy