

Where to Watch Season 1
10 Episodes
- Kwang-soo, a MurdererE3
Kwang-soo, a MurdererWhile on a vacation in Jeju Island, Kwang-Soo wakes up with a hangover and finds a dead woman in his room. Fearing that the police will brand him as a suspect, he flees the scene and decides to find the murderer himself. The six other detectives receive a call from K, saying that Kwang-Soo has become a murder suspect. This leads them to investigate the case in an effort to prove his innocence, or else they would have to arrest him. - Messages from the DeadE4
Messages from the DeadJong-min encounters a child who gives him the diary of a teen girl. He finds out that the girl had recently died at Songdo Central Park under mysterious circumstances and receives a call from K, who tells him to gather the detectives at the high school where she attended to look into her death. During the investigation, the detectives discover that her friends have been receiving text messages from her even after she died. - Battle of the DetectivesE6
Battle of the DetectivesTwo rival curators of an art museum enlist the help of K's detectives and the Genius Detective Team in an attempt to outshine each other. The competition between the two teams becomes fierce as they must find the self-portrait of a recently deceased artist before the painting is auctioned off on the same night. - The Vanished MagicianE7
The Vanished MagicianThe detectives attend a magic show rehearsal to support Sehun, who would be opening the show with a dance performance. During the rehearsal, the magician mysteriously disappears while performing one of his tricks, which sends the crew in a panic as the show would be happening in a few hours. As a result, the director asks the detectives to find him before the show begins. - Operation: Criminal TransportE9
Operation: Criminal TransportYeon-Seok turns himself in and requests that K's detectives should be the one to transport him to prison. Although this confuses the detectives, they accept his request in exchange for information about Project D and his involvement with it. While on their way to prison, Jae-Suk receives a phone call from an unknown man demanding Yeon-Seok to be brought to him, or else, a bomb that he planted onto a stranger's bag will be detonated. - The Disappearance of KE10
The Disappearance of KThe detectives receive a scheduled message from K that was written three months ago, during the planning of the murder game party. He tells them that a final test for them is waiting at a safe house in Incheon. However, they also receive a message from a familiar voice saying that he has kidnapped K.