A new murder case involving a fire seems to resemble one from Kang Seong-mo and Lee An's past; Yoon Jae-in runs after a peeping Tom.

Lee An attempts to prevent his expulsion from school, and finds an unlikely ally in Jae-in; Eun Ji-su identifies a lead in the murder case.

Hiding her family background from her classmates, Jae-in heads to her part-time job; another victim emerges in Seong-mo and Ji-su's investigation.

Jae-in is a police officer and Lee An is trying to become one; Ji-su tells Seong-mo about her blind date.

Jae-in hesitates when asked for a favor and needs convincing; Lee An notices that Seong-mo is being followed by someone.

A mystery surrounding a dead woman has the police stumped and in need of clues; Jae-in gets to work on helping Lee An hone his abilities.