Hyung In and the police start the investigation to find Jae Young. Hyung In meets Jae Young's school friends and they tell him about a tape. Hyung In finally obtains the tape, but a creepy and weird sound comes out from the tape. Meanwhile, Jung Hyun also tries to find Jae Young on her own. At places she visits, she gets to see some strange patterns. She knows that she has seen the patterns before, but don't remember what they are.

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 video tape 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.

Due to an explosion, Hyung In's partner Si Jeong gets injured, which devastates Hyung In. This makes him drop the case. However, a key suspect of Jae Young's case, Kim Hwan Kyu turns himself in. Jung Hyun hears from Jae Young's friends that Jae Young had sent them a message a month before Kim Hwan Kyu turned himself in, and this makes Jung Hyun believe that Jae Young is still alive.