Rank: Inspector Gender: Female Age: 28 Ability: Profiling Appearance: Brown medium-length hair with gray eyes Personality: Calm and cool-headed but playful Height: 165cm Features: Leader of the Mystery Investigation Unit. Often called Inspector Park or Team 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: Terrible sense of direction. Called Inspector Gak. Member of the Mystery Investigation Unit. Refers to his unlocking skills as "popping it open." Carries a lockpick with a star ornament. Constantly talks about quitting but never actually does.

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

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

Rank: Sergeant Gender: Male Age: 25 Partner: Ddoni Ability: Encyclopedia Appearance: Brown hair, brown eyes Personality: Very playful and active Height: 180cm Features: Frequently causes trouble. Always eating cookies. Member of the Mystery Investigation Unit. Called Sergeant Gong.

Rank: Officer Gender: Male Age: 24 Partner: Guest Ability: Sixth Sense Appearance: Light brown hair, squinted eyes Personality: Timid and easily scared, but playful Height: 180cm Features: Screams a lot. Member of the Mystery Investigation Unit. Called Officer Deok.

Rank: Officer Age: 27 Partner: Su-hyeon Gender: Female Personality: Gentle and calm Called Officer Shin. Member of the Mystery Investigation Unit.

Rank: Officer Age: 26 Partner: Gong-ryong Gender: Female Personality: Bright and active Called Officer Ddo. Member of the Mystery Investigation Unit.

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

Rank: Officer Age: 30 Partner: Gak-byeol Gender: Male Personality: Lazy and indifferent Uses Gyeongsang-do dialect. Called Officer Kim. Member of the Mystery Investigation Unit.