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 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.