How to Tame a Villain Character

Tiara was killed in the real world and then reincarnated to live in the body of a noblewoman in the novel she read named Claudia Ambelynn. When she lived in the novel world, she was reunited with the main protagonist who was her husband who was killed in the real world. In addition, she also met the murderer in the novel world and also played the role of the main protagonist's older brother who was known as the most cruel character. It was not that easy for Tiara to live in the novel world written by her husband. She had to carry out a mission that she had to conquer the heart of the antagonist, Duke Harry, in order to return to the real world. This made Tiara think, if she lived in Claudia's body and married Harry, then she could take revenge on the murderer who killed her husband in the real world. The way to do that, she would try everything so that Harry would really fall in love with her. She was forced to cancel her engagement with Duke Harris in order to take revenge on Duke Harry. How did Claudia succeed in conquering Duke Harry's heart?