Field Supervisor of the Teachers' Rights Protection Agency. A man and former Special Forces member who laughs a lot. In the Agency, there are no restrictions on any method of education. Wears a civil servant style: black clothes, jacket, belt, long black pants, and black shoes. He saved Im Hallim in the past. The Agency was created after his fiancée died.

Black hair. She was bullied and beaten in the past, and the person who helped her then was Na Hwajin. She resembles actress Jin Ki-joo. A strong woman and former Special Forces member who fights like a Jeet Kune Do practitioner. Good at boxing. Has a crush on Bong Geundae. A Field Supervisor for the Agency. She calls Na Hwajin 'Captain.' Has a crazy instructor-like way of speaking. Flirting with Bong Geundae.

Handsome. An administrative officer at the Agency who is skilled at hacking. A man. Has a crush on Im Hallim. Resembles Block B's P.O. Easily frightened. Flirting with Im Hallim.

Head of the Agency. Father of Na Hwajin's deceased fiancée. A man. Dresses like a president. Part of the Ministry of Education. Surprisingly good at fighting.

The villains.