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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 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

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

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 21, 2021

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

May 5, 2021

The drama's climactic sequence across the Gangwon countryside.