Two friends in the past were victims of serious school bulling. One could not resist his trauma, and becomes a serial killer, walking in the path of r…
Kyung-min leaves a message for Jong-seok at the crime scene, reuniting them after 20 years.
Jong-seok aids Ji-na and uncovers Kyung-min's alias while he plots revenge.
Kyung-min leaves a second message at a murder scene, stirring Jong-seok's trauma.
A special task force forms as Jong-seok and Ji-na pursue Kyung-min.
Humiliated by a stranger, Ji-na confronts Jong-seok, who shares his past.
Jong-seok and Ji-na find Kang-min. Kyung-min quizzes him about Cheol.
