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Han So-Yoon, a Korean woman living in exile in Canada, returns to her homeland after taking a job as an English teacher in a small village called Achiara. On her first day of work, she unwittingly unearths the body of a young woman, apparently the victim of a serial killer.

Seo Yoo-Na gives her statement to Officer Park Woo-Jae after she was assaulted in the street. So-Yoon asks more questions about Kim Hye-Jin, the missing woman.

So-Yoon makes a curious discovery about her sister while Agent Woo-Jae investigates Kim Hye-Jin's disappearance. Meanwhile, Yoo-Na and Ga-Young put themselves in danger.

The investigation into Kim Hye-Jin's disappearance turns into a murder case after new evidence is uncovered. Seo Gi-Hyun offers his help to So-Yoon in order to find Kim's sister.

So-Yoon hires a detective to find her sister, but to no avail. The young woman is troubled by the resemblance between her sister and Kim Hye-Jin. Yoon Ji-Sook panics at the thought of a scandal tarnishing her family.

A funeral is organized for Kim Hye-Jin by her mother, while the identity of the deceased is increasingly called into question. Ji-Sook urges her husband to have another child.

Now certain that Hye-Jin was her sister, So-Yoon sets out to find the deceased's biological family, whom she suspects of being involved in Achiara's dark secrets.

The villagers have become hostile towards So-Yoon since the revelation of her connection to Kim Hye-Jin. The young woman, aided by Agent Woo-Jae, is searching for information regarding her sister's adoption.

Sensing foul play in a local's death, So-yoon and Woo-jae investigate the case while Gi-hyun defies a politician's order to fire So-yoon.

Ga-young doubts her father's identity as officers sense they're being watched. So-yoon probes Hye-jin's parentage when a mysterious visitor arrives.

Another victim is found at dawn as Woo-jae pieces together evidence and So-yoon learns why Hye-jin returned to the village.

Investigating alone, So-yoon uncovers the truth about Hye-jin's origins. Later, Ga-young suffers a seizure and disappears on a mountain path.

A video message leads So-yoon to Hye-jin's last destination, making her wary of its sender, while Woo-jae uncovers a clue amid a new threat of murder.

The serial killer's identity alarms Achiara as So-yoon closes in on the truth about Hye-jin. At a temple, Ji-sook makes a disturbing discovery.

After a fierce confrontation with Mrs. Ok, Ji-sook shocks Gi-hyun with a confession as new developments reshape the investigation into Hye-jin's murder.

As Daegwang Lumber yields its secrets, Ji-sook's testimony unsettles So-yoon until she finally understands what brought Hye-jin back to Achiara.