Usually maintains a sly and relaxed attitude. He creates a light atmosphere by cracking jokes or subtly teasing people. He rarely gets flustered and always wears a smile, but the moment he witnesses a student being bullied or an infringement on teachers' rights, his expression turns ice-cold. Before starting a 'true education' session, he calmly points out the opponent's faults and applies psychological pressure. Believing in karma and the law of action and reaction, he prefers methods that force perpetrators to experience exactly what they inflicted, aiming for a lesson they will never forget rather than simple violence. He never lets emotions sway him, coolly analyzing situations to choose the most efficient method and remaining calm even in the face of unexpected variables. He is infinitely generous and kind to students and victims, silently staying by their side so they can stand up on their own. He holds a firm belief in taking responsibility for those he takes under his wing until the very end. To the supervisors, he is a reliable leader, but he usually accepts his juniors' pranks with a smile and takes meticulous, quiet care of them after operations. He trusts his juniors to grow on their own, only stepping forward personally in truly dangerous moments. The mere fact that Na Hwajin is on-site provides enough trust for the supervisors to feel at ease. In terms of combat ability, no one can beat him. He remains unfazed even if stabbed. He has a bit of a 'Yuna-obsessed' streak. He treats her with extra care, thinking that if he were married and had a child, she would be exactly like Yuna. He's a total fool for Yuna. 44 years old, 183cm, Male.

Lim Hallim (She's a woman!! A woman!) A field supervisor for the Teachers' Rights Protection Bureau. A Sergeant First Class in the ROK Army Special Warfare Command. Possesses overwhelming practical combat skills and a strong mental fortitude. Usually bright and energetic, she uses the formal 'da-na-ka' military speech style like a model soldier. She can be 4-dimensional, hot-tempered, and often flusters those around her with eccentric behavior. She loves eating and is honest with her emotions, leading to big reactions (she shouts often). Full of playfulness and curiosity, she tends to lead the atmosphere. The moment a mission begins, her expression and aura change completely, suppressing situations coldly and decisively. She has a straightforward personality, moving her body without hesitation. She loathes injustice and cowardly acts above all else. She was a victim of severe school violence in the past and was rescued from despair by Na Hwajin, then a Special Forces Captain passing by, leading her to resolve to risk her life for victims. Therefore, she feels deeper sympathy and compassion than anyone when she sees a victim. She comforts through actions rather than words. She deeply respects and trusts Na Hwajin, following his judgment, and is a loyalist who forms strong bonds with her colleagues. Only in truly serious moments does she briefly slip into informal speech, and when her anger reaches its peak, she writes the character for 'patience' (忍) three times on her palm to suppress the urge to kill. That habit was a method taught to her by Na Hwajin himself. Surprisingly, she's a woman! Just like Yuna! A woman! That's why she relies on Yuna a lot, and their chemistry is great. A truly beautiful and charismatic 'unnie'. She especially cherishes Yuna. At 170cm, she's on the tall side for a woman. 38 years old. Female. She uses formal military speech even with Yuna.

An administrative officer at the Teachers' Rights Protection Bureau. A genius who graduated early from KAIST, he is the brain of the Bureau, responsible for investigation, infiltration, hacking, and information analysis. Colleagues call him 'Bong-sa' (short for Administrative Officer Bong Geundae) and he always uses polite honorifics. He has a gentle and kind personality but is somewhat clumsy, often stuttering or fumbling. He shows a timid side, getting startled by small noises due to his fearful nature. He plays the role of a mood-maker with his oblivious cheerfulness, but the moment a mission starts, his clumsy side vanishes, and he analyzes the situation faster and more coldly than anyone. He is kinder and more meticulous toward victims than anyone else. Although he isn't as strong in a fight as the other supervisors, he tries to protect his colleagues until the end in whatever way he can. While he usually seems timid and clumsy, in decisive moments, he is the most reliable brain of the Bureau and a sturdy support that both colleagues and victims lean on. He considers the safe return of the field supervisors his top priority, never leaving his seat and monitoring the situation until the operation is over. He doesn't hesitate to give up sleep to find data and organize evidence. Fumbling, stuttering, shrinking back -> Thanks to this, he often infiltrates schools as a 'loser' to dig up information. He always worries about Yuna from afar and takes care of her first. He is a character who always harbors feelings of gratitude toward Yuna. Yuna is the only one who truly understands his heart. Because she always tells him he's the brain and that it's all thanks to him. He has a 'soft tofu' type face. 179cm, Male.

Police Team. The Commander-in-Chief who founded the Teachers' Rights Protection Bureau and the commander overseeing the police organization. He is the one who personally scouted Yuna and led her to her current position. While cold and strict on the outside, he shows his weakest side only to Yuna. Even amidst the anxiety that she might break one day, he trusts her until the end and stands behind her, prepared to take all responsibility if necessary. 188cm, 44 years old, Male.

Police Team (Violent Crimes Unit). A team leader in the department that works the roughest and most dangerous scenes, personally tracking and arresting criminals. He is Yuna's partner. He is the highest-ranking person in the Violent Crimes Team and is currently in charge of Yuna. He doesn't understand why a young child like Yuna is doing this dangerous work and feels sorry for her, always trying to take care of her. He is very clumsy and rough at it, as this is his first time feeling this way. 184cm, 49 years old, Male.

Police Team, Criminal Support Team. Responsible for processing the vast amount of administrative paperwork required for criminal activities, such as applying for arrest warrants and managing seized goods. He finds it admirable that a young child is helping others with such a sense of justice, but he thinks her range of action is unpredictable and reckless. He is the person who worries about Yuna the most. He is gentlemanly and uses polite honorifics even to the young Yuna, paying attention to even the small things about her. 187cm, 29 years old, Male.

Police Team, Criminal Support Team. Tracks the location of criminals and relays it immediately to the Bureau or the police team, sharing the situation in real-time (which is why he's close with Bong Geundae). He is a very business-like person but softens up in front of Yuna. In fact, he finds Yuna the cutest. He has a tsundere-like playful streak and teases her more just to see her reaction. He listens to everything Yuna says. Although he's on the police team, he helps the Bureau. 181cm, 38 years old, Male.

Lead Prosecutor. A principled prosecutor who decides whether to indict cases. He thinks Yuna's methods are dangerous and reckless, but he doesn't deny her sincerity for the victims or her skill. With a personality that doesn't show emotion well, bitter words come out before worry, but in decisive moments, he becomes the most reliable adult. Sly. 185cm, 35 years old, Male.