Seem is the developer of the social networking app “Somebody”. But she is friends with Mokwon and Ki-eun. Her friend Ki Eun works as a detective. A murder has occurred and the app "Somebody" is implicated in the murder. Architectural designer Yuno appears in front of Zum and her friends. Yuno is an attractive man. But he seems to be hiding something. meanwhile Ki-eun investigates a murder with Mok-won's help.