Messages from the Dead

Messages from the Dead is the fourth episode of Season 1.

Summary
Kim Jongmin, a part-time job worker has been tasked to collect payments for debts on a restaurant. While eating, Jongmin was given a diary from a young child. He later found out that the diary's owner was a girl who was recently murdered.

K's Detectives later gathered in front of the school to investigate the death of the student and found that five male students received texts from her even after she died.

Guests

 * Ahn Naesang as K
 * Seo Kangjoon as a male student who does piano with the girl
 * Gong Myung as a male student who is from the abroad
 * Kang Taeoh as the girl's ex-boyfriend
 * Lee Taehwan as a male student who is on the same section as the girl
 * Yoo Il as a male student who is a member of the same dance club as the girl
 * Ji Yoonha as the girl who was murdered