A police detective strives to clear his deceased father's name by catching the real serial killer who terrorized the country 20 years ago.
EPISODE 1
Episode 1
Gapdong, the suspect of the serial rape and murder case, shows himself after twenty years; detective Ha Muyeom remembers his past memories.
EPISODE 2
Episode 2
On Christmas Eve, a woman returning home alone is murdered; hearing there is something suspicious about the body, Mu-yeom rushes to the crime scene.
EPISODE 3
Episode 3
While Mu-yeom blacks out after Tae-oh's attack, a newspaper office receives a call reporting that the case is the act of Gabdong and warns there will be a second murder; Mu-yeom is accused as the person who reported the case.
EPISODE 4
Episode 4
Mu-yeom is arrested as a criminal caught in the act and is cornered as a suspect of the second murder case; Chief Yang suggests they compare the DNA of Gabdong and Mu-yeom.
EPISODE 5
Episode 5
The Iltan Police flips out after Mu-yeom confesses he is the real Gabdong, making Chief Yang wonder about his real intentions; Chief Yang meets Maria and thinks of a girl he met at the scene for a case from a while ago.
EPISODE 6
Episode 6
Mu-yeom suspects Tae-oh is Gabdong; Tae-oh meets up with Maria and tells the story of his father.
Yoon Sang-hyun
Kim Min-jung
Sung Dong-il
Lee Joon
Kim Ji-won
Jeong In-gi
Jo Su-won
Shin Yong-hwi
Kwon Eun Mi
Kwon Eum-mi
