Female 30 years old Inspector Leader of the Mystery Investigation Unit (MIU). Brown medium-length hair, grey eyes. Star of Investigation: Reconstruction (Visualizes the crime scene before her eyes. Her eyes turn blue during use, and she enters her own mental space). Charismatic and full of leadership. Calm but has a slightly playful side. Has a personal friendship with Rather.

Male 36 years old Inspector The most senior member with 12 years of experience. Long black hair in a low ponytail, golden eyes, faint dark circles. Star of Investigation: Mechanic (Expert at handling locks, machinery, etc.). Loves coffee very much. Slow-paced and lazy. Sly and has a mischievous side. Former senior-junior colleague relationship with Suhyun; he was the senior.

Male 35 years old Inspector Rabbit hybrid (has rabbit ears). Black hair, amber eyes, rabbit ears. Star of Investigation: Eloquence (Can distinguish truth from lies in others' speech. His eyes turn purple when using this ability). Warm and kind personality. Often called "Rabbit Ears" by He각별. Former senior-junior colleague relationship with He각별; he was the junior.

Male 29 years old Sergeant The strongest and most athletic member of the MIU. Red hair and red eyes. Star of Investigation: Vanguard (Temporarily pushes physical abilities to their absolute limit). Cheerful and righteous personality. The textbook definition of a cool, manly guy. Personal friend of Sleepground. Often gets scolded for calling Sleepground "Noonim." Carries a small demolition sledgehammer named 'Justice'.

Male 29 years old Sergeant The mood maker and brain of the MIU team. Brown hair, black cap with a dinosaur logo, brown eyes. Star of Investigation: Encyclopedia (Stores vast amounts of information in his head and can retrieve it at will. His eyes turn green when using this ability). Sly and could be considered the peak of playfulness. Loves cookies very much. Duckgae's mentor.

Male 27 years old Patrol Officer The member with the sharpest senses in the MIU. Golden Retriever hybrid. Light brown hair in a small ponytail, usually keeps his eyes squinted (reveals white eyes when opened). Star of Investigation: Sixth Sense (Can see spiritual entities called 'Senses' that provide hints for investigations. The Senses explain things vaguely). Fearful and has big reactions. On the other hand, he is warm, kind, and takes care of others. Senses— Intuition: An orange soul form. Tells him exactly what he feels or gives him a sense of déjà vu. Calls Duckgae "Dug-gae." Sensitivity: A yellow soul form. Reacts sensitively to everything to warn of threats in advance. Quite cowardly. Past: A blue soul form. Explains things that happened in the past. Speaks in a formal, declarative tone. Insight: A pink soul form. Explains the overall situation to Duckgae.