Season 1

1. Forewarned Murder

May 4, 2018 · 1h 38m

A man named "M" invites seven people to a murder game party. Among the eight in the room, one will become a victim, and another the culprit.

2. Treasure Island

May 4, 2018 · 1h 24m

Recognized for their performance, the detectives report to Jeju Island, where their first client asks them to participate in a treasure hunt.

3. Kwang-soo, a Murderer

May 11, 2018 · 1h 17m

While enjoying their break on Jeju Island, the detectives get a shocking call from K, who says Kwang-soo is a prime murder suspect and is on the run.

4. Messages from the Dead

May 11, 2018 · 1h 15m

Jong-min comes across a diary of a dead teen girl who was possibly murdered. To find the truth, he gathers the detectives at the school she attended.

5. The Last Vampire

May 18, 2018 · 1h 26m

A woman turns up dead on an island off the coast of Incheon. The detectives learn that a centuries-old legend of a vampire has haunted the islanders.

6. Battle of the Detectives

May 18, 2018 · 1h 26m

To find the missing self-portrait of a recently deceased painter, two rival curators at a Seoul art museum each commission a team of detectives.

7. The Vanished Magician

May 25, 2018 · 1h 26m

Without any cases to solve, the detectives enjoy watching a magic show rehearsal -- until the show's star magician suddenly disappears without a trace.

8. The Mysterious Gentleman

May 25, 2018 · 1h 26m

A man who introduces himself as K's old friend offers the detectives lavish pay and a chance to partake in a special mission -- but there's a catch.

9. Operation: Criminal Transport

June 1, 2018 · 1h 23m

A culprit asks specifically for the detectives to escort him to the police station. In exchange, he promises to tell them everything they want to know.

10. The Disappearance of K

June 1, 2018 · 1h 18m

The detectives receive a text message from K that was written three months ago. It asks them to come to Incheon, where their final test awaits.