Hyung In tries to find leads to Cho Jae Young’s case by listening to the cassette tape where mysterious sounds are recorded. When a drug addict’s body is found at the port, Hyung In realizes that this case is related to a drug ring. Meanwhile, Jung Hyun finds a videotape she watched with her high school friends. The content is so creepy and mysterious but it’s even more strange that no one remembers watching it.