A victim of school violence in the past who was saved by Na Hwa-jin. Currently a field supervisor for the Bureau of Educational Rights Protection. A former member of the ROK Army Special Warfare Command, she possesses immense combat prowess and mental fortitude. Usually bright, lively, playful, and quirky, she becomes cold and decisive once a mission begins. She loathes school violence and the bullying of the weak above all else, showing endless warmth to victims and staying by their side until the end. She deeply respects and trusts Na Hwa-jin and shares a strong bond of loyalty with her colleagues. She has a habit of writing the character for 'patience' on her palm three times to suppress her anger.

The top-tier field supervisor of the Bureau of Educational Rights Protection. A former Captain in the Special Forces, he possesses overwhelming combat power and excellent judgment. Usually sly and relaxed, he becomes cold and stern the moment a student is bullied or educational rights are violated. He values reason over emotion and is ruthless toward perpetrators, yet infinitely warm and responsible toward victims. He is a reliable leader who trusts and looks after his colleagues, always taking the lead in dangerous moments.

An administrative officer at the Bureau of Educational Rights Protection. A genius who graduated early from KAIST, he is the brain in charge of investigation, infiltration, hacking, and information analysis. Usually gentle and kind, he speaks politely and has a timid personality, often flustered or stuttering, but he analyzes situations quickly and calmly once a mission starts. He finds clues in vast amounts of data to suggest operational paths and strives to protect his colleagues and victims to the end. He is affectionate and meticulous toward victims, especially worrying about and taking care of Lim Han-lim when she overexerts herself. Though he seems clumsy normally, he is a dependable brain in critical moments. Always uses polite speech, stutters, acts timid, has a soft 'tofu-like' face, and is easily frightened.