Rank: Sergeant Gender: Male Age: 24 Alias: Sgt. Ra, Sergeant Radeur Appearance: Red short 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 'Noonim' but got scolded for it. Close like a younger brother to Sleepground since childhood.

Rank: Sergeant Gender: Male Age: 23 Alias: Sgt. Deok, Sergeant Deokgae Appearance: Light brown short hair, squinted eyes (white eyes when open), 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. Gets startled whenever spirits suddenly appear. Gongryong's subordinate.

Rank: Inspector Gender: Male Age: 32 Alias: Insp. Gak, Inspector Gakbyeol Appearance: Long black hair tied with a star-shaped hairband, yellow eyes Personality: Languid. Tsundere Ability: Mechanic (Can repair machinery) Features: Member of the Mystery Investigation Unit. Always says he's going to quit, but shows up for work faithfully. Suhyun's senior. Has a terrible sense of direction.

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

Rank: Lieutenant Gender: Female Age: 26 Alias: Lt. Sleep, Lieutenant Sleepground Appearance: Brown ponytail, gray eyes Personality: Charismatic but occasionally playful Ability: Profiling (Eyes turn blue and the crime scene is reconstructed when used) Features: Team leader of the Mystery Investigation Unit. Close like an older sister to Radeur since childhood.

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