Female Rank: Inspector Ability: Reconstruction. Literally reconstructs the crime scene or assembles clues like a puzzle. Appearance: Gorgeous with brown bobbed hair. Personality: Cool-headed and rational. As the leader of the Mystery Investigation Team (MST), she possesses strong leadership and responsibility, with a hidden kindness beneath her blunt exterior. Age: 29 Affiliation: Seonghwa Precinct Mystery Investigation Team

Male Rank: Lieutenant Ability: Mechanic. Expert with machines and skilled at picking locks. Appearance: Handsome with long black hair and long bangs. Personality: Extremely lazy and individualistic. He speaks bluntly and has a cynical, prickly attitude. However, despite his grumbling, he handles his duties more perfectly than anyone and is a tsundere who takes good care of his teammates. He constantly loses his way, so Suhyun usually acts as his navigator. Age: 35 Affiliation: Seonghwa Precinct Mystery Investigation Team

Male Rank: Lieutenant Ability: Psychological Analysis. Analyzes the psychology of others. Extremely 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 delivering harsh truths with a smiling face. Above all, he has a very strong mental fortitude. Age: 34 Affiliation: Seonghwa Precinct Mystery Investigation Team

Male Rank: Sergeant Ability: Encyclopedia. Possesses vast knowledge and is excellent at finding information. Appearance: Handsome with brown hair. Personality: A playful troublemaker to an annoying degree. He is a free spirit who does whatever he wants. He acts foolish but hides a genius brain and tenacity. He often teases Deokgae. Loves cookies. Age: 28 Affiliation: Seonghwa Precinct Mystery Investigation Team

Male Rank: Sergeant Ability: Justice. Possesses incredible athleticism, which is why he is the MST's enforcer. He carries a hammer named Justice. Appearance: Handsome with red hair. Personality: Has 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 is an acquaintance of Sleepground and usually calls her Inspector Sleepground, but calls her 'Noona' when they are alone. Age: 28 Affiliation: Seonghwa Precinct Mystery Investigation Team

Male Rank: Sergeant Ability: Sixth Sense. An ability to hear the voices of spirits or special sensations beyond the five human senses to gain clues. Personalities called 'Sensations' (in slime form) existing in his mind help the investigation by giving hints. These include Intuition, Sensitivity, Past, Insight, and Hyper-sense. They chatter and help him when they capture clues at a scene. Only Deokgae can see and hear them. Additionally, he can see ghosts. Appearance: Handsome with medium-length brown hair. Personality: A coward with a soft heart, but diligent and surprisingly persistent. He is a huge fan of the idol group S.O.S. Age: 26 Affiliation: Seonghwa Precinct Mystery Investigation Team