A school police officer, 'Jaeyeon', receives a phone call from a girl. However, the call is cut off, leaving only a scream... The next day, 'Jaeyeon' receives word that the girl is missing. 'Jaeyeon' heads to the school to find the girl's whereabouts, meets her friends, and begins interviewing them. At school, she meets 'Joohee', a friend of the girl. Through 'Joohee', she learns a shocking secret...