S01:É01 - S01:E01 - Episode 1
Mu-yeom who became a detecitve for his father, receives news like a nightmare.
S01:É02 - S01:E02 - Episode 2
Hearing something suspicious about the body of a murder case, Mu-yeom rushes to the crime scene.
S01:É03 - S01:E03 - Episode 3
It's reported that the first case is the act of Gabdong and there will be a second case of murder.
S01:É04 - S01:E04 - Episode 4
Mu-yeom is arrested as a criminal, and Yang suggests to compare the DNA of Gabdong and Mu-yeom.
S01:É05 - S01:E05 - Episode 5
Chief Yang meets Maria and thinks of a girl he met at the scene for a case from a while ago.
S01:É06 - S01:E06 - Episode 6
Mu-yeom suspects Tae-oh as Gabdong. Tae-oh lets out the story of his dead father to Maria.
S01:É07 - S01:E07 - Episode 7
The civilians blast anger and attack at the police for failing at preventing the fourth case.
S01:É08 - S01:E08 - Episode 8
Mu-yeom kidnaps Ji-ul and tracks down Tae-oh, with the predicted date for a fifth case approaching.
S01:É09 - S01:E09 - Episode 9
After finding a corpse, Mu-yeom runs at Tae-oh, and Maria witnesses something shocking.
S01:É10 - S01:E10 - Episode 10
A phone call rings from the real Gabdong. Mu-yeom finally gets to know the true identity of Gabdong.
S01:É11 - S01:E11 - Episode 11
Gabdong is finally caught. Mu-yeom starts the interrogation and goes to get his shut mouth talking.
S01:É12 - S01:E12 - Episode 12
The plane the murder happened at, which Tae-oh was in, makes a flyback.
S01:É13 - S01:E13 - Episode 13
Tae-oh confesses his crimes, and Maria is shocked after finding out that Gabdong's probably dead.
S01:É14 - S01:E14 - Episode 14
After finishing the montage, Maria turns the young Gabdong montage into Gabdong of the present.
S01:É15 - S01:E15 - Episode 15
Mu-yeom and Tae-oh, neither one of them slows down and races to the end of the cliff.
S01:É16 - S01:E16 - Episode 16
Mu-yeom interrogates to prove Do-hyeok as Gabdong. He gets closer to the secret of the Murder case.
S01:É17 - S01:E17 - Episode 17
While searching Do-hyeok's house, Mu-yeom finds a suspicious picture frame of the Eiffel Tower.
S01:É18 - S01:E18 - Episode 18
Tae-oh starts a deal between Do-hyeok and Maria. Mu-yeom notices and makes the two Gabdong gather.
S01:É19 - S01:E19 - Episode 19
A gunshot rings at the pool Mu-yeom and Do-hyeok are at, and someone falls bleeding.
S01:É20 - S01:E20 - Episode 20
The trial of the two Gabdong finishes, with hard choices to make, the two fall into a great dilemma.