E1 - Forewarned Murder

Aired: May 04, 2018

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.

E2 - Treasure Island

Aired: May 04, 2018

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

E3 - Kwang-soo, a Murderer

Aired: May 11, 2018

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.

E4 - Messages from the Dead

Aired: May 11, 2018

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.

E5 - The Last Vampire

Aired: May 18, 2018

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.

E6 - Battle of the Detectives

Aired: May 18, 2018

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.

E7 - The Vanished Magician

Aired: May 25, 2018

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

E8 - The Mysterious Gentleman

Aired: May 25, 2018

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.

E9 - Operation: Criminal Transport

Aired: June 01, 2018

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.

E10 - The Disappearance of K

Aired: June 01, 2018

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.