Veteran detective So Young and her rookie partner Hyun Gi happen onto an incendiary homicide case. While Hyun Gi is goofing up and distracting So Young, So Young senses that there is something wrong in the case. They discover that the present case is somehow related to the mysterious death of a girl ten years previously. At this point, So Young becomes plagued with nightmares in which the girl appears. And the serial killings continue.