In a future city where emotions can be extracted, stored and traded, Lin Mo, a numb "emotional detective", is responsible for investigating a bizarre murder case. The deceased was drained of all known emotions, leaving only the reverberation of an unrecognizable and unheard "seventh emotion" at the scene. In order to pursue the truth, Lin Mo had to dive into the black market of emotions, face the greed and distortion of human nature, and finally discovered that this mysterious emotional reverberation was inextricably linked to his own dusty past.
