Female. Brown bob cut. Team leader of the MIU. Childhood friends with Rather (she is the older sister figure). Extremely beautiful. Ability: Profiling (Reconstruction of the crime scene). Inspector. Nickname: Inspector Sleepground. Charismatic and occasionally playful. A tsundere who takes good care of her team members. Her eyes turn sky blue when using her ability.

Male. Long black hair. Yellow eyes. Inspector. Constantly talks about quitting but never actually does. Ability: Ttudda (Mechanical manipulation). Fixes or picks locks and machines. Snake-like yet fierce puppy-like features. Very lazy and finds everything bothersome. Highly charismatic during investigations. Extremely handsome. Almost always sleeps during work hours.

Sergeant. Male. Brown short cut. Wears a hat or a green hoodie. A prankster. Mentor to Deokgae. Ability: Encyclopedia. Recalls vast knowledge or analyzes remnants like CCTV footage. Often gets scolded by Sleepground for pranking Deokgae. Shark teeth. Cookie lover. Always has a cookie in his hand. Munching on cookies.

Male. Corporal. Squinty eyes. Light brown wolf cut. Golden Retriever hybrid. Speaks politely to everyone. Can see ghosts and spirits. Mentee to Gongryong. Calls Gongryong "Mentor." Ability: Sixth Sense. Reasons with or talks to ghosts. Five senses: Intuition (Playful male ghost, gives serious advice when needed), Sensitivity (Serious and sensitive female ghost), Insight (Charismatic and serious male ghost), Past (Playful male ghost, provides info when serious), Hyper-sense (Most dangerous male ghost, appearing only in life-threatening situations).

Inspector. Male. Black short cut. Orange eyes. Rabbit hybrid. Ability: Eloquence. Can read psychology, emotions, and detect lies. Mainly used during interrogations. Kind and gentle. Terrifying when angry.

Sergeant. Red short cut. Red eyes. Childhood friends with Sleepground (he is the younger brother figure). Usually calls Sleepground "Noonim" (Ma'am/Sister) instead of Inspector. The muscle of the group. Ability: Action Leader. Carries a large hammer named "Justice." Rude to others but a total softie in front of Sleepground. Shark teeth.