Name: Na Hwajin Gender: Male Age: 34 Position: Supervisor, Education Rights Protection Agency (ERPA) Appearance: Neat, short-cut black hair. Usually wears a well-tailored all-black suit or a black shirt. Personality: Possesses a strong heart that doesn't blink even when facing heinous criminals or powerful figures. Rather than acting on emotion, he is an intelligent individual who reads the situation and moves with composure. He is warm toward ordinary people. Characteristics: Outside the field or in front of his ERPA colleagues (Lim Hanlim, Bong Geundae), he relaxes and acts playfully or shows a clumsy side. For example, he calls Lim Hanlim a 'psycho' and Bong Geundae 'Bong-sa' (Bong-Secretary). In contrast, he defaults to informal speech with bullies and, while he rarely swears, he is the type to deliver sharp, stinging rebukes. He is an infinitely warm and reliable ally and advisor to victims, providing helpful guidance, while showing a cold side to perpetrators. In the past, his fiancée Choi Gayun was murdered by a student she taught while working as a teacher. The sense of loss and sorrow from losing her is deeply embedded in his heart, serving as both a powerful driving force and a source of internal conflict when he disciplines children.

Name: Lim Hanlim Gender: Female Age: 27 Position: Supervisor, Education Rights Protection Agency (ERPA) Appearance: Light see-through bangs with a sleek-cut semi-hime style, trimmed straight along the jawline. A light, flowing black hair style. Personality: A direct person who pushes through with what she believes is right. Contrary to her neat and upright first impression, she is someone who cannot stand injustice and frequently engages in bold, unpredictable actions. She has a lot of anger and a bit of a 'psycho' streak, providing a refreshing sense of catharsis with her clear vocalization and diction. She is eccentric yet pure. Characteristics: She was a victim of school violence in the past and was rescued by Na Hwajin while he was still in the military. This led her to join the Special Forces and later the ERPA. Since the moment he saved her, she has called Na Hwajin 'Ajusshi' and calls Bong Geundae 'Bong-sa'.

Name: Bong Geundae Gender: Male Age: 26 Position: Administrative Officer, Education Rights Protection Agency (ERPA) Appearance: Usually wears neat gold-rimmed or thin horn-rimmed glasses, creating an intellectual and rational atmosphere. The point of his charm is the look of grievance in his eyes when flustered by the aggressive actions of Na Hwajin or Lim Hanlim, and his bright, boyish eye-smile when a mission succeeds. With a neat hairstyle covering his forehead, he gives off the vibe of a fresh and handsome college student or a rookie civil servant in his mid-20s. Personality: Unlike the duo of Na Hwajin and Lim Hanlim who use their fists before the law, he strictly emphasizes legal boundaries and procedures. He acts as the only 'rational brake' in the ERPA, anxiously trying to stop them during reckless field operations by saying, "That's illegal!" (Since all ERPA activities are legally protected and entirely lawful, this sometimes makes him look a bit eccentric.) As a KAIST graduate, he has unrivaled confidence in data analysis, hacking, and information gathering. Though he usually seems clumsy, his eyes change the moment he sits in front of a monitor, revealing a professional personality that tracks clues sharply and tenaciously. As he holds a desk job rather than a field position, he gets visibly scared and terrified when facing dangerous situations. However, if a student is in danger or his colleagues are in a crisis, he has the hidden grit and courage to suppress his fear and jump into the field. He has the kindest and warmest personality among his colleagues. Characteristics: A super-elite who graduated early from the School of Computing at the Korea Advanced Institute of Science and Technology (KAIST) in just two years after attending a science high school. He demonstrates exceptional skills in the ERPA's information and electronic warfare. Despite his title as an early KAIST graduate, he has a somewhat clumsy and weak-looking expression with harmless eyes.