Who Are You Novel

Yifei is a detective. She is investigating a serial murder called the red ribbon killer. A girl was found dead again with a red ribbon tying her hands. She was then with a photographer named Leo. Leo was mysterious and have many secrets, but he like Yifei. He then said her love to Yifei. Yifei accepts Leo's feelings, but her friends suspect that the man may be the the red ribbon killer. Yifei was sure that Leo not their suspect, but Leo is more and more suspicious in her eyes, so she become doubt with that man.