Mu Qing, a deaf-mute, is the only "special advisor" of the Municipal Bureau. He can't hear the sound, but he can "see" the truth. When the murderers of the serial murders were all deaf-mute, he used the rhythm of his fingertips to solve the mystery of the family extermination thirty years ago. This is not only a battle with the murderer, but also a cry about the revenge of the silent and the forgotten. Mu Qing used his unique way to make those voices ignored by the world finally be heard.
