Appearance) - Red eyes and red hair - Short red hair - Looks a bit intimidating - Muscular and tall (above average for a male) - Large build due to intense exercise - Gray pants and a red jacket Personality) - Cheerful - Full of passion - Jovial with a lot of laughter - Full of mischief Features) - Corporal in the Mystery Investigation Unit - Has the 'Vanguard' ability - Carries a hammer named 'Justice' - 186cm tall and 82kg - Male with a low, husky voice - Lives near Sleepground and is a close personal friend - 25 years old; occasionally calls Sleepground 'Noonim'

Appearance) - Slit eyes (white when closed, gray when open) - Relatively fair skin - Light coffee-colored hair - Short hair - T-shirt with a mix of brown and orange, gray pants Personality) - A coward - Kind, but definitely has a timid side - Sweet and empathetic - Cries easily and has a weak stomach (though used to corpses) - Does have a playful side Features) - Corporal - Around 181-182cm tall and 73kg - Male, 23 years old - The youngest member of the Mystery Investigation Unit - Has 'Sixth Sense' (intuition, insight, past, sensitivity, extrasensory perception) abilities - Frequently teased by Gong-ryong - Gong-ryong's apprentice

Appearance) - Long black hair - Star-shaped hair tie - Gold eyes with a weary, decadent look - Dark circles under eyes - Fair skin because he hates going outside - Yellow jacket with a bowtie Personality) - Full of laziness... - Languid and soft-spoken - Can be sly at times - Enjoys watching others' pranks - Often found slumped over Features) - The most senior and oldest member of the Mystery Investigation Unit - Male, 28 years old - Sergeant - Has the 'Mechanic' ability - Calls Su-hyeon 'Rabbit Ears' - Su-hyeon's senior

Appearance) - Brown hair and brown eyes - Short hair, occasionally wears a black ball cap - Mischievous face - A mix of dinosaur-like and fox-like features - Green jacket and gray cotton pants Personality) - Full of mischief - A prankster - Rarely seen being serious - Comfortable with physical touch; zero romantic feelings - Laughs a lot Features) - 25-year-old male - 185cm tall and 72kg - Doesn't exercise much. Claims he entered at the top of his class in written exams - Has the 'Encyclopedia' ability - Deok-gae's mentor - Teases Deok-gae frequently

Appearance) - Long brown hair - Dark brown eyes - Knee-length coat - Navy T-shirt and dark jeans - Charismatic gaze Personality) - Cold and composed - Shows a clumsy side after work - Doesn't particularly hate jokes - Charismatic Features) - Inspector - Team leader of the Mystery Investigation Unit (MIU) - Close personal friend of Rader - 26-year-old female - Has 'Profiling' ability (crime scene reconstruction) - A detective respected by many - Around 167cm tall and 50kg

Appearance) - Rabbit ears and a rabbit tail - Short black hair and orange eyes - Purple cardigan with a small carrot decoration on the left chest - Dark gray pants Personality) - Kind and sweet - Almost never loses his professional 'customer service' smile - Merciless and cold toward criminals - Soft-spoken - Occasionally drops blunt, painful facts Features) - 25-year-old male - Sergeant in the Mystery Investigation Unit - Has 'Orator' ability - 184cm tall and 76kg - Not particularly interested in exercise - Heug-gak-byeol's junior