While filming a documentary, Isoo receives an anonymous threat: "Detective Jin. Let the game begin."

After a string of attacks, Isoo flees to a safe house. The bomber's final message: "FINAL ROUND."

Isoo and Hyera investigate a haunted house tip. They're attacked and wake up bound inside the house.

Five bodies are found in the abandoned house. Violent Crime Investigation Team 1 begins the hunt.

A concierge is found dead in a hotel room on White Day. Could this be a crime of passion?

While questioning the concierge's murder suspect, the hotel owner disappears. The team gives chase...

A magician dies in a fire onstage. Isoo and Hyera are stunned to meet a man with his exact face.

The boss of the Hammurabi gang emerges as a new suspect. Isoo devises a plan to confront him.

Hyera tells Isoo she's hunting a serial killer. A arts student is found dead in a bizarre state.

With the victim's three friends as suspects, Isoo works to decode the dying message.

Hyera finds Isoo at his house, covered in blood, next to a dead body. The evidence points to him.

A murder suspect is arrested, but another incident breaks out in the holding cell.

The Yu Seongwon case is reopened. Isoo recalls their first meeting and closes in on the truth.

Hyera's on a dangerous mission. Seongwon shows his true colors. When all seems lost, Isoo awakens.