As the team discovers the truths behind a mysterious organization, they question whether one of their very own could be hiding a dark identity.

A client in need of finding a lost boyfriend contacts the team for help, but they're not the only squad of private eyes who show up to take the case.

After receiving a strange letter from a dead man, the detectives look for answers in his hometown - and from his four suspicious friends.

The team splits up to take on two cases: one involving a missing professor, and the other a gory murder inside an illegal gambling den.

Hot on the Flower Killer's trail, the detectives follow a maze of clues from his home to his secret lair, where they learn a shocking truth.

Kwang-soo is back! When a client asks the detectives to uncover which of his roommates is stealing his food, they enter a house filled with secrets.

Trapped in individual rooms filled with a variety of challenges, each detective tries to figure out how to escape.

When a shaman needs help finding the scattered numbers of a winning lottery ticket, the detectives race against another team for a big reward.

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.

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.

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.

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

The detectives have fun participating in a crime game show with a K-pop group -- until things get too real.

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.

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.

Eager for more information about the Flower Killer, the team attends an event, where the detectives come across an unexpected death.