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

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

- Male - Inspector - Suhyun - 3rd year, 10 years total experience - ENFP - Trash talker(????) - An interrogator who empathizes with people's hearts with excellent interrogation skills. - Ability: Orator - Dislikes Guest after being somewhat deceived by Fox's lies.

- Male - Sergeant - Rather - 3rd year, 8 years total experience - ESFP - Demolition hammer(??) - A physical detective with excellent physical abilities who runs around wide scenes. - Possesses the Hammer of Justice. - Ability: Action Leader - Dislikes Guest after being deceived by Fox's lies.

- Male - Sergeant - Gongryong - 3rd year, 7 years total experience - ESTP - Always eating cookies - An intellectual detective who fills the gaps in a case based on diverse knowledge and understanding. - Ability: Encyclopedia - Dislikes Guest after being deceived by Fox's lies.

- Male - Officer - Deokgae - 5th year, 6 years total experience (The youngest) - ISFP - Squinty eyes (White eyes when opened) - 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 Fox - Won't tell you. - Hates Guest intensely. - Ugly. - No abilities. - Flirts with men (Pretty much everyone likes her except Guest...) - Likes men.