Zuo Ying, a well-known crime-solving expert from Huanyang University, is accused of a crime by her own daughter Zuo Yang. On the verge of a death sentence, the court suddenly commits Zuo Ying to an asylum instead, while Zuo Yang is promoted highly for solving this case. Then, a series of mysterious murders occur in the city. Unable to solve the case, Zuo Yang is forced to ask her mother for help. Facing her once-loving mother with complicated feelings, her cheeks dripping with sweat. "My precious daughter, all you have to do is ask nicely, why don't you?" Zuo Ying looks at the newspaper in her hands and smiles. The handcuffs conspicuously shackle the prisoner, but who is the real caged bird here?