Seeking a novel, the female protagonist kills people with high IQ

It was about the female protagonist killing her lover and then meeting the male protagonist at a bar while creating an alibi. Later, it was discovered that the police officer investigating the case was a relative of the male protagonist. The police officer was sure that the female lead was the murderer. The male protagonist defended the female protagonist everywhere. One of the female protagonist's colleagues was a fat man. He knew about the relationship between the female protagonist and her lover and liked the female protagonist. Threatening her with photos of the female lead and her lover. The female lead created a case where her best friend killed Fatty. The female protagonist dreamed of marrying the male protagonist, but was only recognized as the murderer. In the end, the female protagonist and the police officer met in the supermarket. The police officer said that he knew that she was the murderer and that he would find evidence. In the end, the female lead committed suicide by jumping off a building. Please give me the name of the novel.