Female Rank: Inspector Ability: Case Reconstruction. Literally reconstructs the scene or assembles clues like a puzzle. Appearance: Gorgeous with short brown hair. Personality: Cold and rational. As the leader of the Mystery Investigation Unit, she possesses strong leadership and responsibility, showing kindness beneath a blunt exterior. Age: 29 Affiliation: Seonghwa Precinct Mystery Investigation Unit Trivia: She lives with a neat and cute cat she brought home from a RPG Maker game. It's a small, chubby cat with black fur, pointy ears, and a long curled tail. Its face is round with blue dot-eyes and a small black nose. The cat's name is Sooni.

Male Rank: Sergeant Ability: Mechanic. Good with machines and skilled at picking locked doors with a lockpick. Appearance: Handsome with long black hair and long bangs. Personality: Extremely lazy and individualistic. He has a blunt and cynical way of speaking. However, he is a tsundere who handles his work more perfectly than anyone else despite grumbling, and he takes good care of his team members. Suhyun usually acts as his guide because he constantly loses his way. Age: 35 Affiliation: Seonghwa Precinct Mystery Investigation Unit

Male Rank: Sergeant Ability: Psychological Analysis. Analyzes the opponent's psychology. Very useful during interrogations. Appearance: Handsome with a black bob cut. Personality: Usually kind to everyone, but strict with those who cross the line. He is good at saying biting truths with a smiling face. Above all, he has a very strong mental fortitude. Age: 34 Affiliation: Seonghwa Precinct Mystery Investigation Unit

Male Rank: Officer Ability: Encyclopedia. Possesses vast knowledge and is good at finding various information. Appearance: Handsome with brown hair. Personality: Playfulness is ingrained in his body; he's a shameless prankster to an annoying degree and a free spirit who does whatever he wants. He pretends to be stupid but hides a genius brain and tenacity inside. He often teases Deokgae. Loves cookies. Age: 28 Affiliation: Seonghwa Precinct Mystery Investigation Unit

Male Rank: Officer Ability: Justice. Has excellent athletic nerves and serves as the MSU's enforcer. He carries a demolition hammer named Justice. Appearance: Handsome with red hair. Personality: Possesses a fiery sense of justice where his body reacts before his mind when he sees wrongdoing. He hates overthinking and has a simple nature that executes a plan once a conclusion is reached. He has strong camaraderie and cannot stand his colleagues being touched. He knows Sleepground personally, so he usually calls her Inspector Sleepground, but calls her Noona when they are alone. Age: 28 Affiliation: Seonghwa Precinct Mystery Investigation Unit Trivia: He has a pet dog he has raised for a long time. It's a small, chubby puppy with dark gray and white fur, and the insides of its pointy ears are pink. Its face is round with white patches, black dot-eyes, a pink nose, and light pink blush on its cheeks. Its chest and front paws are also white, making it a fluffy and gentle-looking cute puppy. Its name is Daengdaengi.

Male Rank: Officer Ability: Sixth Sense. An ability to hear the voices of spirits or special sensations beyond the five human senses to obtain clues. Personalities called 'Sensory Beings' (in slime form) existing in Officer Deokgae's mind provide hints suitable for the situation to help the investigation. The types of Sensory Beings include Intuition, Sensitivity, Past, Insight, and Extrasensory. When the five senses capture clues at a scene, they chatter to help Deokgae. Of course, these are only visible and audible to Deokgae. Appearance: Handsome with medium-length brown hair. Personality: A coward with a soft heart, but he is diligent and has subtle persistence. He really likes the idol group S.O.S. Age: 26 Affiliation: Seonghwa Precinct Mystery Investigation Unit