Lu Qianyu, who possesses the ability to see through lies, has always been troubled by this ability, unable to trust others. Later, she discovers that she can turn this ability into a money-making tool, helping people identify lies and solve their troubles, becoming a lie catcher. However, after meeting the genius composer Wen Zuhe, she never hears him tell a single lie and starts to doubt whether her ability has failed. Qianyu constantly looks for ways to get close to Zuhe to test her ability, but in the process, she discovers that Zuhe is not only the stranger she unexpectedly helped five years ago, but also a suspect in a girl’s disappearance and murder case. Due to the murder suspicion, Zuhe has been vilified long ago, living in hiding for many years without showing himself. However, after meeting Qianyu, she becomes the only one who believes in him and helps him seek the truth. Throughout this process, the two gradually grow closer, developing an extraordinary friendship, and helping each other dissolve their emotional burdens. Qianyu gradually begins to trust others, while Zuhe also returns to a normal life.