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March 3, 2021

A serial killer terrorises a province. Jung Ba-reum (Lee Seung-gi), an idealistic rookie police officer, is partnered with Go Moo-chi (Lee Hee-jun), a detective driven by personal tragedy. The Chuncheon countryside crime scene establishes the drama's tone.

March 3, 2021

The killer's victims and their families. The drama's commitment to showing the human cost of the crimes rather than aestheticising the violence is established.

March 10, 2021

Ba-reum and Moo-chi pursue the killer through the Gangwon countryside. Their partnership — contrasting styles, contrasting motivations — begins to form.

March 10, 2021

A flashback storyline: what if psychopathy could be identified prenatally? The drama introduces its science-fiction premise.

March 17, 2021

Ba-reum's backstory — his childhood, his relationships — surfaces. The drama begins planting seeds the audience will not recognise until much later.

March 17, 2021

The pattern connecting the murders becomes clear. The Chuncheon police station sequences.

March 24, 2021

Moo-chi's personal connection to the killer — the murder of his family — drives his investigation in ways that compromise his objectivity.

March 24, 2021

A discovery that reframes everything the audience thought they understood about Ba-reum.

March 31, 2021

The drama's central mystery at its most opaque — and its central twist beginning to become visible to attentive viewers.

March 31, 2021

The drama's central revelation. Everything prior to this episode must be reinterpreted. Lee Seung-gi's performance pivots completely.

April 7, 2021

The immediate aftermath of the revelation. The drama's second half begins.

April 7, 2021

Moo-chi, with new information, begins a new investigation. The Chuncheon crime scenes are revisited with different eyes.

April 14, 2021

Ba-reum's internal world — his reasoning, his self-justification — is shown from the inside. Lee Seung-gi at his most unsettling.

April 14, 2021

The drama's critique of how institutions fail to identify and contain psychopathic behaviour is at its most explicit.

April 21, 2021

A case involving someone falsely accused because of the drama's central psychopathy premise.

April 21, 2021

Moo-chi closes in on the truth he has been pursuing across the drama's entire run.

April 28, 2021

The direct confrontation between Moo-chi and Ba-reum. Lee Hee-jun and Lee Seung-gi's best shared scene.

April 28, 2021

The full origin story — what created Ba-reum — is revealed.

May 5, 2021

The drama's climactic sequence across the Gangwon countryside.

May 5, 2021

The finale. One of the most ambitious Korean thrillers of 2021 — a drama that used the concept of the psychopath gene to ask whether evil is innate or manufactured, and declined to answer simply.