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

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.

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

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

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.

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.

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

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

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.

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