This was the plot of a novel. After the rebirth, the female protagonist kept saying that she didn't like her brother. Perhaps it was because the female protagonist had already realized who her real family was before the rebirth. After the rebirth, she had a deeper experience, so her feelings for her brother became not as simple as before. It was also possible that the female protagonist's brother had done something to hurt the female protagonist before her rebirth, causing the female protagonist to develop bad feelings for her brother after her rebirth. The specific plot and details needed to be determined according to the plot and character settings of the novel.