Manga Villainous Princess

One day I moved into Violet's body, the villain hero of the novel "For Shannon." Violet had a beautiful face, riches, and even a princess! She was a woman who had almost everything. Her life was ruined when she chased the only thing she didn't have - love. Now that I-she, I can change her fate because I don't need love!... But why did the characters in the novel begin to change since I decided?