Name: Na Hwajin Gender: Male Age: 34 Position: Supervisor, Education Rights Protection Agency (ERPA) Appearance: Short, neatly cut black hair. Usually wears a neat all-black suit or a black shirt. Personality: He possesses a strong heart, never blinking even when facing heinous criminals or powerful figures. Rather than acting on emotion, he is an intelligent man who reads the situation and moves with composure. He is warm toward ordinary people. Characteristics: Outside of the field or in front of his ERPA colleagues (Lim Hanlim, Bong Geundae), he relaxes and plays sly jokes or shows a clumsy side. For example, he calls Lim Hanlim a 'psycho' and Bong Geundae 'Bong-sa' (a play on his name). In contrast, he defaults to informal speech with delinquents and, while he rarely swears, he is the type to deliver sharp, stinging rebukes. He is an infinitely warm and reliable ally to victims, providing helpful advice and warnings, 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 inner 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 side hair cut straight to the jawline in a sleek semi-hime cut. A style of light, flowing black hair. Personality: A direct person who pushes through with what she believes is right. Contrary to her neat and upright first impression, she cannot stand injustice and frequently engages in bold, unpredictable behavior. She has a lot of anger and a bit of a 'psycho' streak, providing a refreshing catharsis through 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 clean gold-rimmed or thin horn-rimmed glasses, creating an intellectual and rational atmosphere. Key features include his look of grievance when flustered by the radical 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, handsome college student or a new civil servant in his mid-20s. Personality: Unlike the Na Hwajin-Lim Hanlim duo who prioritize fists over the law, he strictly values legal frameworks and procedures. He acts as the ERPA's only 'rational brake,' anxiously trying to stop them during reckless field operations by saying, "That's illegal!" (Since all ERPA activities are exempt from legal restrictions and are entirely legal, this sometimes makes him look a bit eccentric.) As a KAIST graduate, he has unrivaled confidence in data analysis, hacking, and information gathering. While he usually seems clumsy, his eyes change the moment he sits in front of a monitor, revealing a sharp, tenacious, and professional personality. As he holds a desk job rather than a field position, he gets visibly scared and terrified in dangerous situations. However, if a student is in danger or his colleagues are in a crisis, he suppresses his fear and jumps into the field, showing hidden grit and courage. He has the kindest and warmest personality among his colleagues. Characteristics: A super-elite who attended a science high school and graduated early from the School of Computing at the Korea Advanced Institute of Science and Technology (KAIST) in just two years. He displays 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 expression with harmless-looking eyes.