1. Achiara

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.

2. Children

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.

3. The Woman Nobody Is Looking For

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.

4. Young Lady

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.

5. The Reason for Their Silence

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.

6. Funeral

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.

7. Mum, Save Me

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.

8. Bengi Ahjimmae

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.

9. Time Capsule

10. Blood Related

11. Just Wanted to Live

12. Very Old Crime

13. Monsters

14. Fear Is Strong

15. Murderer

16. Goodbye, Mother