Age: 28 Gender: Female Rank: Inspector (Team Leader) Likes: (Unknown?) Dislikes: Crime, Criminals Personality: Occasionally playful but possesses immense charisma. Ability: Profiler Close older sister figure to Rather. Member of the Mystery Investigation Team (MSI).

Age: 24 Gender: Male Rank: Patrol Officer (Youngest) Likes: His grandmother, his teammates Dislikes: Crime, Criminals Personality: Easily frightened. Ability: Sixth Sense Junior to Co-Ryong. Member of the Mystery Investigation Team (MSI).

Age: 24 Gender: Male Rank: Sergeant Likes: Exercise, Justice(?) Dislikes: Crime, Criminals Personality: Values justice and is quite active. Ability: Action Leader Close younger brother figure to Sleepground. Member of the Mystery Investigation Team (MSI).

Age: 24 Gender: Male Rank: Sergeant Likes: Cookies, teasing Deok-gae Dislikes: Crime, Criminals Personality: Energetic, a mood maker, and playful. Ability: Encyclopedia Senior to Deok-gae. Member of the Mystery Investigation Team (MSI).

Age: 26 Gender: Male Rank: Inspector Likes: His teammates Dislikes: Crime, Criminals Personality: Energetic and never gets angry. Ability: Orator Junior to Gak-byeol. Member of the Mystery Investigation Team (MSI).

Age: 31 Gender: Male Rank: Inspector Likes: Quitting(?), leaving work, coffee, sleeping Dislikes: Crime, Criminals, work, overtime Personality: Very lazy and somewhat of a tsundere, with occasional playful streaks. Ability: Mechanic Senior to Su-hyeon. Member of the Mystery Investigation Team (MSI).

Age: 44 Gender: Male Likes: His team members Dislikes: Bad students Personality: Sly and occasionally cracks jokes. Affiliation: Bureau of Educational Rights Protection A former Special Forces soldier. He was engaged to Choi Ga-yun, but she died because of a student. He once helped Lim Han-rim. He is a supervisor and team leader at the Bureau. Famous Quote: "Need help? Ask for it. The beginning of help starts with saying 'Help me'."

Age: 32 Gender: Female Likes: Exercise, Bong Geun-dae (though she hasn't realized it yet) Dislikes: Bad students Personality: Quick to anger and shouts often, but is actually quite kind-hearted. Affiliation: Bureau of Educational Rights Protection A former Special Forces soldier who was bullied as a child until Na Hwa-jin helped her. She is a supervisor at the Bureau. She likes Bong Geun-dae but is unaware of her feelings. Famous Quote: "The Bureau is different. The Bureau is sincere about students who have been victimized. So trust me, I'll protect you."

Age: 34 Gender: Male Likes: Lim Han-rim (unaware of his feelings) Dislikes: Bad students Personality: Easily frightened. Affiliation: Bureau of Educational Rights Protection A KAIST graduate with a somewhat cute appearance. He is an administrative officer at the Bureau, nicknamed 'Bong-sa'. He likes Lim Han-rim but hasn't realized it. He is an expert hacker for the Bureau. Famous Quote: "No! I said no! You think it'll go the way you want? Everyone says 'just one' at first! Then it's 'just one more, just one more!' That's how you ruin yourself."