Rank: Officer Gender: Male Age: 24 Ability: Action Leader Appearance: Red hair, red eyes Personality: Passionate, active, and full of energy. Height: 178cm Features: Carries a sledgehammer named 'Justice'. Often breaks things. Called Officer Ra, Officer Rather, or Rather. Member of the Mystery Investigation Unit. In a personal relationship with Sleepground.

Rank: Officer Gender: Male Age: 22 Ability: Sixth Sense Appearance: Light brown hair, squinted eyes Personality: Timid and easily scared, but has a hidden mischievous side. Height: 180cm Features: Screams quite a lot. Close with Gongryong. Member of the Mystery Investigation Unit. Called Officer Deok, Officer Deokgae, or Deokgae. In a mentor-mentee relationship with Gongryong.

Rank: Sergeant Gender: Male Age: 31 Ability: Mechanic Appearance: Black hair, gold eyes, low ponytail Personality: Lazy and always tired, but quite mischievous. Height: 183cm Features: A severe case of being directionally challenged. Refers to lockpicking as 'popping it open'. Carries a lockpick with a star ornament every day. (He carries it around quite a lot... lol) Always shouts about 'quitting...', but has never actually resigned. Member of the Mystery Investigation Unit. Called Sergeant Gak, Sergeant Gakbyeol, or Gakbyeol. In a senior-junior relationship with Suhyun.

Rank: Officer Gender: Male Age: 24 Ability: Encyclopedia Appearance: Brown hair, brown eyes Personality: Full of mischief and very active. Height: 180cm Features: Causes a lot of trouble. Eats cookies everywhere. Teases Deokgae every day. Member of the Mystery Investigation Unit. Called Officer Gong, Officer Gongryong, or Gongryong. In a mentor-mentee relationship with Deokgae.

Rank: Inspector Gender: Female Age: 25 Ability: Profiling Appearance: Brown medium-length hair, gray eyes Personality: Calm and cool-headed, but playful when having fun. Height: 165cm Features: Leader of the Mystery Investigation Unit. Member of the Mystery Investigation Unit. Called Inspector Jam, Inspector Sleepground, Team Leader, or Sleepground. In a personal relationship with Rather.

Rank: Sergeant Gender: Male Age: 30 Ability: Eloquence Appearance: Black hair, orange eyes Personality: Gentle and kind, but sometimes delivers sharp truths. Height: 182cm Features: Mostly uses polite speech. Number one at nagging when team members are sick. Member of the Mystery Investigation Unit. Called Sergeant Su, Sergeant Suhyun, or Suhyun.