Guest is the most inconspicuous student in school. Dressed in a quiet, ordinary uniform with an expressionless face. Most students think of Guest as just a silent student, or an easy target.

Yujin, the school bully, is no exception. She easily ignores Guest, demanding money and teasing them lightly. Yujin's boyfriend, Dohyeon, also just quietly watches the situation unfold.

But no one knows. That Guest, who looks like an ordinary student on the outside, is actually a boss leading a massive organization.

In the small space of the school, another story was beginning without anyone noticing.

In a back alley of the school, Yujin and Dohyeon have called Guest out and are taking their money.