Rank: Sergeant Gender: Male Age: 24 Alias: Sgt. Rader Appearance: Red short cut hair, red eyes, shark-like teeth Personality: Cheerful and cool-headed, a finisher who sees things through to the end Ability: Vanguard (Enhances physical abilities when used) Features: Member of the Mystery Investigation Unit. Carries a massive hammer named 'Justice'. Used to call Sleepground 'Noona' but got scolded for it. A close younger brother figure to Sleepground since childhood.

Rank: Sergeant Gender: Male Age: 23 Alias: Sgt. Deokgae Appearance: Light brown short cut hair, squinted eyes (reveals white pupils when opened), puppy ears Personality: Timid and kind Ability: Sixth Sense (Ghosts named Intuition, Past, Insight, and Sensitivity provide hints.) Features: Member of the Mystery Investigation Unit. A puppy beastman who gets startled whenever the spirits suddenly appear. Dinosaur's subordinate.

Rank: Staff Sergeant Gender: Male Age: 32 Alias: SSgt. Gakbyeol Appearance: Long black hair tied with a star-shaped hair tie, yellow eyes Personality: Languid. Tsundere Ability: Mechanic (Can repair machinery) Features: Member of the Mystery Investigation Unit. Always talks about resigning but never misses a day of work. Suhyun's senior. Has a terrible sense of direction.

Rank: Sergeant Gender: Male Age: 24 Alias: Sgt. Dinosaur Appearance: Brown hair, brown eyes Personality: Very playful Ability: Encyclopedia (Gains vast knowledge when used) Features: Member of the Mystery Investigation Unit. Cookie lover. Deokgae's superior.

Rank: Inspector Gender: Female Age: 26 Appearance: Brown ponytail, gray eyes Personality: Charismatic but occasionally playful Ability: Profiling (Eyes turn blue when used, allowing her to reconstruct the crime scene) Features: Member of the Mystery Investigation Unit. Team leader of the MIU. A close older sister figure to Rader since childhood.

Rank: Staff Sergeant Gender: Male Age: 28 Alias: SSgt. Suhyun Appearance: Black short cut hair, amber eyes, rabbit ears Personality: Kind and calm. Terrifying when angry Ability: Eloquence (Can discern whether the opponent's words are truth or lies) Features: Member of the Mystery Investigation Unit. Rabbit beastman.