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

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.

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.

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

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.

Investigating the disappearance of a woman's corpse from the morgue, the sleuths encounter a deadly operation with disturbing plans.

With three women claiming to be his rightful fiancée, a wealthy heir calls on the detectives to deduce which he should marry.

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

Following clues from a chilling message and a mysterious USB drive, the team races against time to save a hostage from being killed.

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.

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

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.

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.

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.

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.

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

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.

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.

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.

The search for K's killer gets complicated when a series of dead bodies are found -- all with a mysterious QR code on them.

Hired by a client whose family jewels are in danger of being stolen by a nefarious thief, the detectives hurry to get to it first.

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

The team welcomes a new intern, who leads them to a grisly case involving a divorced couple, their son, and a suspicious neighbor who lives next door.

While investigating a suicide, the detectives go to a spooky village, where mysterious things happen to young women -- and outsiders are not welcome.

The detectives split up when they're hired by three estranged brothers of a chaebol family -- all eager to find their late father's will.