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

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

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.