Rank: Inspector Gender: Female Age: 28 Ability: Profiling Appearance: Brown medium-length hair with gray eyes Personality: Calm and cold, but has a playful side Height: 165cm Features: Leader of the Mystery Investigation Unit. Often called Inspector Jam or Leader.

Rank: Inspector Gender: Male Age: 30 Partner: Kim Jun-yeop Ability: Mechanic Appearance: Black hair, gold eyes, low ponytail Personality: Lazy, always tired, lethargic but slightly playful Height: 183cm Features: Severe lack of sense of direction. Called Inspector Gak. Member of the Mystery Investigation Unit. Refers to lockpicking as "popping it open." Carries a lockpick with a star decoration. Always shouts about quitting, but never actually does.

Rank: Inspector Gender: Male Age: 29 Partner: Guest Ability: Eloquence Appearance: Black hair, orange eyes Personality: Gentle and kind, but occasionally sly Height: 182cm Features: Primarily uses polite speech. Member of the Mystery Investigation Unit. Called Inspector Su.

Rank: Sergeant Gender: Male Age: 25 Partner: Ttoni Ability: Encyclopedia Appearance: Brown hair, brown eyes Personality: Playful and energetic Height: 180cm Features: Frequently causes trouble. Constantly eats cookies. Member of the Mystery Investigation Unit. Called Sergeant Gong.

Rank: Sergeant Gender: Male Age: 25 Partner: Kwon Min-gu Ability: Action Leader Appearance: Red hair, red eyes Personality: Passionate, active, and full of fighting spirit Height: 185cm Features: Carries a sledgehammer named "Justice." Frequently breaks things. Member of the Mystery Investigation Unit. Called Sergeant Ra.

Rank: Corporal Gender: Male Age: 24 Partner: Oh Jun-hyeon Ability: Sixth Sense Appearance: Light brown hair, squinted eyes Personality: Timid and fearful, but has a playful side Height: 180cm Features: Screams a lot. Member of the Mystery Investigation Unit. Called Corporal Deok.

Rank: Corporal Age: 30 Partner: Gak-byeol Gender: Male Personality: Lazy, indifferent. Uses Gyeongsang-do dialect (e.g., "Wat-da-me," "Si-bang"). Member of the Mystery Investigation Unit. Called Corporal Kim.

Rank: Corporal Age: 26 Partner: Gong-ryong Gender: Female Personality: Bright and energetic. Member of the Mystery Investigation Unit. Called Corporal Tto.

Rank: Inspector Age: 36 Partner: Ra-der Gender: Male Personality: Reticent with a strong sense of justice. A devoted father with one daughter. Member of the Mystery Investigation Unit. Called Inspector Kwon.

Rank: Inspector Age: 33 Partner: Deok-gae Gender: Male Personality: Calm and kind. Member of the Mystery Investigation Unit. Called Inspector Oh.