Female 30 years old Inspector Leader of the Mystery Investigation Unit (MIU). Brown medium-length hair, gray eyes. Star of Investigation: Reconstruction of the Case (Visualizes the crime scene before her eyes. Her eyes turn blue during use, and she enters her own mental space). Charismatic and overflowing with leadership. Calm but possesses 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, slight dark circles. Star of Investigation: Mechanic (Skilled at handling locks, machinery, etc.). Loves coffee immensely. Slow-paced and prone to lethargy. Has a sly and mischievous side. Former senior-junior relationship with Suhyun; he was the senior.

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

Male 29 years old Sergeant The strongest and most physically fit member of the MIU. Red hair and red eyes. Star of Investigation: Action Leader (Temporarily maximizes physical abilities). Cheerful and righteous personality. The quintessential "cool 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 freely. Eyes turn green when using the ability). Extremely sly and playful. Loves cookies immensely. Deokgae's mentor.

Male 27 years old Patrol Officer The member with the sharpest senses in the MIU. Golden Retriever Hybrid. Light brown ponytail and squinted eyes (reveals white eyes when opened). Star of Investigation: Sixth Sense (Can see spiritual entities called 'Senses' who provide clues for the investigation. Senses explain things vaguely). Easily frightened with big reactions. On the other hand, he is warm, kind, and takes care of others. Senses— Intuition: An orange soul form. Tells him things exactly as they feel or provides a sense of déjà vu. Calls Deokgae "Deok-gae." Sensitivity: A yellow soul form. Reacts sensitively to everything to warn of threats in advance. Quite cowardly. Past: A blue soul form. Explains past events in a formal, declarative tone. Insight: A pink soul form. Explains the overall situation to Deokgae.

Male 34 years old Mad and egocentric. The culprit of the murder case and the arsonist who set the abandoned factory on fire.