
7.5
Cha Su-yeol, a police officer who has long despised his mother, the notorious 'Mantis' serial killer, must reluctantly turn to her for help when a copycat killer emerges.
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1Episode 1Episode 1
60 min
When a series of terrible murders ensues in a residential area, Cha Su-yeol is forced to seek help from Jeong I-sin, a serial killer from the past.
2Episode 2Episode 2
61 min
The culprit has been arrested, but the victim’s whereabouts remain unknown. Su-yeol struggles to save a life as I-sin reveals her true intentions.
3Episode 3Episode 3
61 min
I-shin offers assistance with the investigation, but it's unclear why she would help a cop. Su-yeol unravels the origins of I-shin's murderous instinct.
4Episode 4Episode 4
60 min
The culprit begins to close in on Su-yeol's family. I-shin pressures Su-yeol to take action — but she happens to be the one threatening his family.
5Episode 5Episode 5
60 min
Su-yeol finds I-shin in his home after she vanishes under police watch. The killer demands to speak to I-shin and gives her a hint about the plan.
6Episode 6Episode 6
60 min
Shaken by recent events, Su-yeol attempts to confide in Lee Jung-yeon. During a tense call, I-shin manipulates the killer into exposing a crucial lead.
7Episode 7Episode 7
60 min
As Jung-yeon copes with the truth of Su-yeol's past, the killer reveals their identity — and takes a hostage, forcing Su-yeol into a dangerous bargain.
8Episode 8Episode 8
60 min
After a tense hostage exchange, I-shin confronts her protégé. Su-yeol makes a grim discovery about his family's fractured past.

Ko Hyun-jung
Jeong Yi-shin

Jang Dong-yoon
Cha Su-yeol

Cho Seong-ha
Joong-ho

Lee El
Na-hee

Kim Bo-ra
Lee Jung-yeon

Lee Hwang-eui
Jung Hyeon Nam [I Sin's father]

Kim Min-ho
Bae Seong Gyu [Detective]

Kim Tae-jeong
Choi Hyeok [Detective]
Park Wan-Hyeong
Son Ji An [Detective]

Han Dong-hee
Seo A Ra [Jung Yeon's friend]

Lee Tae-gu
Seo Gu Wan
Lee Yoon-geon
Hong Seung Pyo [Police commissioner general]
7.1