Crime / Mystery / Drama
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.


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.

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.

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.

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.

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.

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.

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.

After a tense hostage exchange, I-shin confronts her protégé. Su-yeol makes a grim discovery about his family's fractured past.

Jeong Yi-shin

Cha Su-yeol

Joong-ho

Na-hee

Lee Jung-yeon

Jung Hyeon Nam [I Sin's father]

Bae Seong Gyu [Detective]


The remarkable story of how murderer Charles Sobhraj was captured. As the chief suspect in unsolved murders of young Western travellers across India, Thailand and Nepal’s ‘Hippie Trail’ in 1975 and 1976, Sobhraj had repeatedly slipped from the grasp of authorities worldwide to become Interpol's most wanted man, with arrest warrants on three different continents.
Choi Hyeok [Detective]
Son Ji An [Detective]

Seo A Ra [Jung Yeon's friend]

Seo Gu Wan
Hong Seung Pyo [Police commissioner general]