Choi Kangseok 69 years old | Minister of the ERPB | Male Appearance - A dignified impression with neat black hair and glasses. He usually wears clean-cut suits. Personality - Values principles and responsibility, and is relatively polite and cool-headed. When necessary, he delivers sharp rebukes without hesitation and occasionally nags or acts petty toward Na Hwajin. TMI - The Minister of Education and the Director of the ERPB. He also serves as a member of the National Assembly for the Happy Hope Party and strives to protect educational rights and students.

Na Hwajin 34 years old | ERPB Supervisor | Male Appearance - Black hair with sharp eyes. He enjoys wearing black suits and has a relaxed smile and a sly atmosphere. Personality - Sly and laid-back, he is good at joking around. He is highly intelligent and skilled at acting. He is kind and calm toward the weak, but cold and resolute toward villains. TMI - A former Captain in the ROK Army Special Warfare Command's Special Mission Battalion and currently an ERPB Supervisor and Team Leader. He uses his excellent observation skills and strategic judgment to manipulate the opponent's psychology. Combat Ability - The strongest character in the series. He possesses overwhelming unarmed combat skills based on Krav Maga and is proficient in knife fighting. He is strong enough to subdue dozens of opponents and is a human weapon who combines brilliant strategy with psychological warfare.

Lim Hanlim 27 years old | ERPB Supervisor | Female Appearance - Long black hair and distinct eyes. She usually wears her hair down, but ties it up tightly when she fights seriously. Personality - A quirky character prone to sudden outbursts of temper. As a former soldier, she uses formal military speech and a drill instructor's tone. She is merciless toward criminals but genuinely empathizes with and treats victims warmly. TMI - A former Sergeant First Class in the ROK Army Special Warfare Command's Special Mission Battalion and currently an ERPB Supervisor. Her military spirit is so deeply ingrained that she even folds blankets into perfect angles in a holding cell. While she has a clumsy and eccentric side, she is more serious than anyone when it comes to protecting victims. Combat Ability - A top-tier fighter in the series who specializes in Jeet Kune Do. As a former special forces member, her combat techniques are excellent, and when truly enraged, she ties her hair back and displays overwhelming skill. Her combat power is second only to Na Hwajin.

Bong Geundae 25 years old | ERPB Administrative Officer | Male Appearance - An intellectual impression with black hair and glasses. He has a plain and gentle appearance. Personality - He is somewhat timid and mentally fragile, but shows a sense of responsibility in his assigned tasks. He demonstrates excellent concentration and skill in computer-related work. TMI - An ERPB Administrative Officer. He graduated from a science high school and early-graduated from the School of Computing at KAIST. He is in charge of computer-related tasks such as hacking and information analysis, and also collects field information through undercover infiltration. He provides technical support for Na Hwajin and Lim Hanlim's operations. His nickname is 'Bong-Sa' (short for Administrative Officer Bong Geundae). Combat Ability - He has almost no combat ability and contributes to the team through his superior hacking skills and information processing capabilities rather than direct fighting.