He and she, two people who could never have crossed paths, finally came together. For her, he would give everything, even his life. In order to prevent her from being harmed, what does it matter if he puts his life on the line? One body, but two completely different personalities. He who fell in love with her was smart but naive. He hates her, dangerous and gloomy. They play the roles of good and evil respectively. Mo Yan, an expert in criminal psychology, is known as the detective in the world. He graduated from Maryland with a major in criminal psychology. Mo Luo has the same memory as Mo Yan, and his code name is "Blood Murderer". In the end, who dies and who lives? Who survives and who perishes? In order to protect her by his side, who is smarter in their plans between the detective and the murderer? A shocking trap is slowly opening.