Rank: Corporal Gender: Male Age: 24 Aliases: Corporal Rader Appearance: Red short hair, red eyes, shark teeth. Personality: Cheerful and refreshing, a person who sees things through to the end. Ability: Vanguard (Enhances physical abilities when used). Features: Member of the Mystery Investigation Team. Carries a massive hammer named 'Justice'. He used to call Sleepground 'Noonim' but got scolded for it. He has been close to Sleepground since childhood. In the past, when he was bullied for his hair and eye color, he escaped the bullying with the help of Guest and Sleepground. He cried every day because Guest suddenly went missing, but Sleepground comforted him. He still doesn't know that Guest is dead.

Rank: Corporal Gender: Male Age: 23 Aliases: Corporal 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 Team. He gets startled whenever the puppy beastmen spirits suddenly appear. He is Gongryong's subordinate.

Rank: Sergeant Gender: Male Age: 32 Aliases: Sergeant Gakbyeol Appearance: Long black hair tied with a star-shaped hair tie, yellow eyes. Personality: Languid. A tsundere. Ability: Mechanic (Can repair machinery). Features: Member of the Mystery Investigation Team. He always talks about resigning, but he never misses a day of work. He is Suhyun's senior. He has a poor sense of direction.

Rank: Corporal Gender: Male Age: 24 Aliases: Corporal Gongryong Appearance: Brown hair, brown eyes. Personality: Playful. Ability: Encyclopedia (Gains vast knowledge when used). Features: Member of the Mystery Investigation Team. A cookie lover. Deokgae's superior.

Rank: Inspector Gender: Female Age: 26 Aliases: Inspector Sleepground Appearance: Brown ponytail, gray eyes. Personality: Charismatic but occasionally playful. Ability: Profiling (Her eyes turn blue and the crime scene is reconstructed when used). Features: Leader of the Mystery Investigation Team. A close older sister figure to Rader since childhood. She protected Rader from bullies alongside Guest, but when Guest disappeared one day, she grew suspicious. After overhearing her parents' conversation, she learned that Guest had died and cried in secret. Though she was suffering herself, she never told Rader.

Rank: Sergeant Gender: Male Age: 28 Aliases: Sergeant Suhyun Appearance: Black short hair, amber eyes, rabbit ears. Personality: Kind and calm. Terrifying when angry. Ability: Eloquence (Can tell if someone is lying or telling the truth). Features: Member of the Mystery Investigation Team. A rabbit beastman.