A new student at a girls high school is assaulted by a mysterious figure while traveling to school.

The girls tell Chae-yool of an urban legend and she discovers who is causing the attacks.

The girls investigate a pupil's violent outburst and Chae-yool learns why the club wanted her.

The girls present their evidence to the class, which forces the bullies to reveal themselves.

The detectives make a tricky bet with a scornful Ra-on to figure out who was behind the shooting.

The girls face an awkward outing with Chae-joon before following a lead from the anti-fan forum.