Accused of killing her husband, a woman is offered a way out by a mysterious stranger: in exchange for a confession in her place, she must commit murder.
Artist Lee Ki Dae is murdered in his studio. His wife, Ahn Yoon So, is held for questioning amid a media frenzy and relentless police investigation.
Prosecutor Baek pressures Yoon So as she is taken back to the crime scene. While she furiously protests her innocence, another woman admits her guilt.
Mo Eun and Yoon So come face to face. After public outcry over the investigation, Baek gets a warrant for the detention center and orders a polygraph test.
Yoon So is given an ankle monitor — and a curfew. After an attorney volunteers to represent Mo Eun, she sends a threatening letter to her new ally.
Yoon So chases a hooded figure just as Mo Eun is reported missing from prison. Baek starts to suspect that the two women may be one step ahead of him.
Yoon So digs up dirt on her target's sinister past and spots a potential clue in the studio. A violent fight breaks out while Mo Eun is left unsupervised.
Both women try to erase evidence which could change the course of the investigation. Meanwhile, Ko Se Hoon is reported missing by his grandfather.
Mo Eun shares evidence that complicates Yoon So's case. As Baek uncovers Se Hoon's fatal crime, a new arrival in the cell stirs up old secrets.
Mo Eun raises eyebrows after a medical emergency. Attorney Jang Jung Goo receives a pivotal phone call, and an escape attempt puts an inmate in danger.
A tense confrontation with Jung Goo, Baek and Mo Eun reveals vital withheld information about the case. A shocking murder confession hits the news.
A hidden motive — and fingerprint — in Lee Ki Dae's murder case leads to an unlikely source. Mo Eun orchestrates a plan after news of a kidnapping.
As the pieces start falling into place in both murder cases, Baek and Jung Goo receive a chilling video. Mo Eun has a final message for Yoon Soo.
