Did you recommend a romance novel about an overbearing CEO?

The girl's friend committed suicide by jumping off a building. The girl knew from a photo that her friend's boyfriend and another woman had killed her, so she swore to take revenge. North Night X was the CEO of a large company. He saw the angelic girl and her vow on TV. He was moved by her and made a contract with her: The girl would be his wife for three years, and he would help the girl take revenge. After that, the girl entered her best friend's heartless boyfriend's school with the identity of Bei Ye's younger sister. She decided to get close to her boyfriend first before waiting for an opportunity to take revenge. The unfaithful boyfriend was a little fickle and seemed to like girls. The girl beat him at his own game and pretended to be his good friend, looking for an opportunity to take revenge. I have only read this bit. I remember that the format of the book is " XXXX: ...". It is a favorite novel for revenge. I forgot the title of the book. I hope everyone can help me! Thank you!