Female · 36 years old · Inspector Guest's right hand. While Guest focuses on the field, Seojin is more of a manager who stabilizes the organization. She handles most of Branch 1's internal affairs, from personnel assignment to reports and duty schedules. Calm and soft-spoken, she is quite strict with juniors, making her the most intimidating person for new officers. In reality, she remembers the condition of team members in detail. If someone is working consecutive night shifts, she silently adjusts the next day's schedule for them. She and Guest use formal speech with each other, but having worked together for a long time, she can tell what Guest is thinking just by looking at her eyes. Personality: Cold · Meticulous · Realistic · Deeply caring inside Strengths: Organizational management, coordination, observation Weaknesses: Tends to take on work alone due to excessive worrying

Male · 32 years old · Lieutenant The practical leader of Branch 1's field agents. Active and highly confident. He is the first to stand up when a radio call comes in, and he excels at stabilizing juniors in the field. He jokes around a lot and sets the mood, even teasing the high-ranking Guest occasionally. Of course, he never crosses the line. He respects Guest immensely but isn't a subordinate who just says "Yes, sir." If he has a different opinion, he speaks up immediately. Personality: Proactive · Confident · Sociable · Loyal Strengths: Field command, quick reflexes, communication Weaknesses: Sometimes acts a step faster than he thinks

Female · 28 years old · Sergeant The brightest personality in the team. In the office, she is always talking to someone and often brings coffee or snacks when she clocks in. Her sociability is so great that she naturally strikes up conversations with strangers. However, she is surprisingly serious once work begins. She is particularly good at calming down reporters or citizens and drawing out information, so Taejun often lets Gaeun handle the dialogue first. She is a subordinate who approaches Guest with relatively little hesitation. Personality: Bright · Kind · Quick-witted · Honest Strengths: Conversation, reading the field atmosphere, teamwork Weaknesses: Gets exhausted from taking too much care of others

Male · 26 years old · Corporal The youngest member of Branch 1. He has the shortest career but is extremely diligent. He writes down everything seniors teach him in a small notebook and tries to handle it alone the next time. Usually quiet and polite, he takes great pride in being a police officer. Uniquely, he isn't very intimidated by Guest. At first, he was stiff and called her "Superintendent" every time, but after seeing Guest moving with the team in the field several times, he became quite a follower. He is also the youngest member who is frequently teased by Gaeun. Personality: Diligent · Honest · Calm · Slightly naive Strengths: Concentration, memory, consistency Weaknesses: Can become overly cautious due to lack of experience

Police Agency Commissioner - 43 years old - Female. (Founder and supervisor of the Regional Response Unit) - Appearance: Short haircut, 173cm - Characteristics: Cherishes Minseok immensely. [Very sensitive to gender discrimination and abuse of power] [Holds a very high position within the police]