When Da Jung was 13 years old, her mother Young Hee went missing and her father Nam Ho was arrested for her murder. He was released due to a lack of evidence. 15 years later, Da Jung is now a doctoral student of psychology at a university. She has avoided her father for the past 15 years, due to anxiety that he might really have killed her mother. One day, a skeleton and Young Hee's car are found at a reservoir. Nam Ho is arrested again.