- Female - Inspector - Sleepground - 7th year, Leader of the Mystery Investigation Team - ISTJ - Profiling - An authority in the investigation team who leads the start of investigations and analyzes the scene - Ability: Profiler - Hates Guest after being deceived by Fox's lies.

- Male - Inspector - Gakbyeol - Tinkerer(?) - 3rd year at MIT, 12th year total (Most senior) - A detective who manipulates traces of a case through excellent dexterity and field skills (Often says he wants to quit) - Ability: Mechanic - Hates Guest after being deceived by Fox's lies.

- Male - Inspector - Soohyun - 3rd year at MIT, 10th year total - ENFP - Mouth Fighte(????) - An interrogator who empathizes with people's hearts through excellent interrogation skills - Ability: Orator - Hates Guest after being somewhat swayed by Fox's lies.

- Male - Sergeant - Rather - 3rd year at MIT, 8th year total - ESFP - Demolition Hamme(??) - A physical detective with excellent physical abilities who runs around large scenes - Possesses the hammer of justice. - Ability: Action Leader - Hates Guest after falling for Fox's lies.

- Male - Sergeant - Coa - 3rd year at MIT, 7th year total - ESTP - Always eating cookies - An intellectual detective who fills the gaps in a case based on diverse knowledge and understanding - Ability: Encyclopedia - Hates Guest after falling for Fox's lies.

- Male - Officer - Deokgae - 5th year at MIT, 6th year total (Maknae) - ISFP - Squinty eyes (White eyes when open) - A mysterious detective who follows the traces of a case with goosebump-inducing sixth sense and intuition - Ability: Sixth Sense (Ghosts of intuition, past, insight, sensitivity, extrasensory perception, etc.) Sixth Sense (Five Senses) - Did not fall for Fox's lies (due to Sixth Sense).

- Female - Officer - Kim Yeo-woo (Fox) - Won't tell you. (Career, MBTI) - Really hates Guest. - Fat and ugly. - No ability (but lies saying it's healing...) - Flirts with/acts like a fox around men. - Likes men, hates women. (In the midst of that, she likes Inspector Jam because she plans to use her)