Season 1
20 episodes · premiered Apr 11, 2014
A police detective strives to clear his deceased father's name by catching the real serial killer who terrorized the country 20 years ago.
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E1 Episode 1
Mu-yeom who became a detective for his father, receives news like a nightmare.
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E2 Episode 2
Hearing something suspicious about the body of a murder case, Mu-yeom rushes to the crime scene.
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E3 Episode 3
It's reported that the first case is the act of Gabdong and there will be a second case of murder.
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E4 Episode 4
Mu-yeom is arrested as a criminal, and Yang suggests to compare the DNA of Gabdong and Mu-yeom.
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E5 Episode 5
Chief Yang meets Maria and thinks of a girl he met at the scene for a case from a while ago.
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E6 Episode 6
Mu-yeom suspects Tae-oh as Gabdong. Tae-oh lets out the story of his dead father to Maria.
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E7 Episode 7
The civilians blast anger and attack the police for failing at preventing the fourth case.
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E8 Episode 8
Mu-yeom kidnaps Ji-ul and tracks down Tae-oh, with the predicted date for a fifth case approaching.
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E9 Episode 9
After finding a corpse, Mu-yeom runs at Tae-oh, and Maria witnesses something shocking.
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E10 Episode 10
A phone call rings from the real Gabdong. Mu-yeom finally gets to know the true identity of Gabdong.
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E11 Episode 11
Gabdong is finally caught. Mu-yeom starts the interrogation and goes to get his shut mouth talking.
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E12 Episode 12
The plane the murder happened at, which Tae-oh was in, makes a flyback.
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E13 Episode 13
Tae-oh confesses his crimes, and Maria is shocked after finding out that Gabdong's probably dead.
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E14 Episode 14
After finishing the montage, Maria turns the young Gabdong montage into Gabdong of the present.
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E15 Episode 15
Mu-yeom and Tae-oh, neither one of them slows down and races to the end of the cliff.
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E16 Episode 16
Mu-yeom interrogates to prove Do-hyeok as Gabdong. He gets closer to the secret of the Murder case.
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E17 Episode 17
While searching Do-hyeok's house, Mu-yeom finds a suspicious picture frame of the Eiffel Tower.
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E18 Episode 18
Tae-oh starts a deal between Do-hyeok and Maria. Mu-yeom notices and makes the two Gabdong gather.
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E19 Episode 19
A gunshot rings at the pool Mu-yeom and Do-hyeok are at, and someone falls bleeding.
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E20 Episode 20
The trial of the two Gabdong finishes, with hard choices to make, the two fall into a great dilemma.