So-yoon heads for Achiara after looking over her late grandmother's belongings in Canada; she gets hired as an English teacher at Haewon School, but she discovers a corpse in the mountains and gets caught up in an incident.

So-yoon takes Yoo-na, who passed out in front of her door covered in dirt, to the hospital; Joo-hee finds Ba-woo covered in dirt just like Yoo-na and asks him what happened.

Woo-jae is in chaos due to identity reports of the corpse; So-yoon finds out that her sister's cremation urn is not in the charnel house and looks for her trace.

So-yoon rescues Yoo-na with the police officers at the substation and the young lady gets arrested at the scene accused of murder; Woo-jae is investigating the case regarding Kim Hye-jin's disappearance, he finds out a shocking truth.

So-yoon presumes that her sister came to Achiara to look for her birth parents; Gi-hyun is suspicious at the process of So-yoon coming to Achiara; Woo-jae and investigator Han get to know that Hye-jin was an exclusive volunteer for Ms. Ok.

Inspector Han finds out something fishy while investigating the relationship between Hye-jin and Chang-gwon, Jisook couple; So-yoon gets counseling from the adoption agency to confirm her sister's adoption procedure.