When the murder of Hye In is solved, Kang Pil Sung is still on the run to hunt So Yoon and to make her happy. After hearing a story of him, So Yoon is still bothered by something.

Now Ga Young has passed away, her mother is filling a complaint. The assumed murderer has been caught and Joo Hee tells So Yoon about Hye Jin's mother.

Officer Han and Woo Jae are breaking into Pil Sung's house to find a nearly killed So Yoon. Pil Sung runs away and tells So Yoon about the father in which she slowly starts to connect the pieces.

The investigators are getting closer to the serial killer and set out a bait on the internet. So Yoon comes closer to finding out the biological father of Hye Jin.

So Yoon is trying to convince Ga Young's mother about Ga Young's Fabry disease. Hyung Kil gives Woo Jae a task to find a walnut tree in order to catch the serial killer. Yoo Na is hospitalized by her mother.

Another murder took place. So Yoon continues to clarify her sister's family line as she finds out about a certain disease. Pil Sung captures photos from So Yoon.

Ga Young heads to the police station together with So Yoon to denounce Gun Woo. Another death person shows up and is classified as accident, while Woo Jae and Officer Han are convinced it to be a murder.

So Yoon digs even deeper into Hye Jin's past when she finds out about a maternal grandmother giving birth to an other child. Ki Hyun faces a difficult choice when he has to choose a side.

Han So Yoon's life in Achiara became more difficult once everyone knows about her connection to Hye Jin, but she won't move until she finds out what happened to her sister and to reveal an illegal adoption business. Woo Jae and So Yoon are making a gruesome discovery.

When Hye Jin's true identity has been discovered, So Yoon continues her investigation to know more about her. Pil Sung remains very curious about the lumber jack owner, while Ji Sook is trying to silence Yoo Na.

Hye Jin's stepmother is inviting everyone for the funeral of Hye Jin. So Yoon and Woo Jae are finding some weird coincidences between Hye Jin and So Yoon's sister.

So Yoon finds out some things about her long lost sister, while Woo Jae and Officer Han are continuing their investigation to find Hye Jin's killer.

So Yoon continues her search for her missing sister, while Woo Jae finally gets permission to investigate the murder of Hye Jin himself.

Yoo Na tells Woo Jae that the body they found is Teacher Hye Jin. Ga Young pushes a student from the stairs and tells Yoo Na that she still wants the job before giving up the murderer. Han So Yoon discovers that her sister may still be alive.

When the police discovers that Yoo Na lied about her night, Ji Sook asks So Yoon to try to shut Yoo Na's mouth to protect her from being judged as possesed.

So Yoon returns to Korea to find relatives and to teach to English, so she decides to move to the peaceful and quiet town of Achiara. The town is shaken when So Yoon discovers a dead body in the woods.