Mystery writer Wen Qing's husband disappears, and she becomes the number one suspect. Her best friend Su Wan was suddenly killed while helping her investigate. Wen Qing discovered in her husband's diary that he had written love letters to four women, and his best friend was one of them. Just when Wen Qing thought she had found the truth, the police told her an even more terrifying fact: her husband had died three months ago. So who is the man who has been sleeping with her in the past three months?