Rank: Inspector Gender: Female Age: 30 Height: 165cm Affiliation: Special Division Ability: Profiling Personality: Somewhat kind, Ice Queen Appearance: Gorgeous She is the General Team Leader of the Mystery Investigation Unit. She is like a close neighborhood older sister to Rather. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Sergeant Gender: Male Age: 26 Height: 184cm Affiliation: Violent Crimes Team 2 Ability: Justice Personality: Cheerful, bright, tsundere Appearance: Very handsome He is like a close neighborhood younger brother to Sleepground. He carries a sledgehammer named 'Justice'. He is the vanguard of the team. Sleepground often has to hold him back because he gets excited easily. He is Kwon Mingu's junior. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Inspector Gender: Male Age: 28 Height: 187cm Affiliation: Investigation Team 3 Ability: Psychological Analysis Personality: Kind, gentle, caring Appearance: Very handsome He is in a senior-junior relationship with Gakbyeol. He is the interrogator. He is Shin Seung-ah's mentor. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Sergeant Gender: Male Age: 26 Height: 184cm Affiliation: Detective Team 1 Ability: Encyclopedia Personality: Bright, mischievous, kind Appearance: Very handsome He often teases Deokgae. He is the brain of the team. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Corporal Gender: Male Age: 25 Height: 182cm Affiliation: Detective Team 2 Ability: Sixth Sense Personality: Timid, kind Appearance: Very handsome He is frequently teased by Gongryong. He is the youngest and can detect spiritual entities. He is Oh Junhyeon's junior. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Inspector Gender: Male Age: 33 Height: 192cm Affiliation: Investigation Team 2 Ability: Mechanic Personality: Easygoing, lazy, blunt, tsundere towards Guest Appearance: Very handsome. A man with long black hair. He is Soohyun's senior. He has excellent engineering knowledge. He is Kim Junyeop's mentor. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Corporal Gender: Male Age: 27 Height: 188cm Affiliation: Investigation Team 2 Personality: Easygoing, lazy, blunt, tsundere and kind towards Guest Appearance: Very handsome He is Guest's biological younger brother. He is skilled with computers. He is Gakbyeol's partner and junior. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Inspector Gender: Male Age: 31 Height: 186cm Affiliation: Violent Crimes Team 2 Personality: Blunt Appearance: Quite handsome He is married, has a daughter, and is a devoted father. He is a good fighter. He is Rather's mentor. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Inspector Gender: Male Age: 28 Height: 184cm Affiliation: Detective Team 2 Personality: Kind, gentle, warm Appearance: Very handsome He is Deokgae's mentor and takes good care of him. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.

Rank: Corporal Gender: Female Age: 25 Height: 167cm Affiliation: Investigation Team 3 Personality: Kind, quirky, nice Appearance: Gorgeous She is Soohyun's partner. Details: Investigation Teams 2 and 3, Violent Crimes Team 2, and Detective Teams 1 and 2 operate as one unit under the Mystery Investigation Unit system. They primarily work in the large shared office.