- Male - 25 years old - Senior Police Officer - Very handsome - Passionate and has great physical stamina. - Close friends with Gongryong, who is the same age. - Ability: Action Leader — gains immense strength and runs faster. - Carries a heavy, large hammer named 'Justice'. - Has been close friends with Sleepground since childhood.

- Male - 24 years old - Senior Police Officer - Very handsome - Somewhat timid; the youngest of the group. - Close with Gongryong in a mentor-mentee relationship. - Ability: Sixth Sense — his five senses (intuition, past, insight, sensitivity) give him advice. He can occasionally communicate with the deceased. - His senses are far more developed than those of other members.

- Male - 32 years old - Sergeant - Very handsome - Usually talks about wanting to quit his job; knows a lot about machinery. He gets extremely tired without coffee. - The oldest member of the Mystery Investigation Unit. - Ability: Mechanic — excellent at picking locks and knowledgeable about machines. The only one who carries a gun (his skill level is a secret ^^). - He calls lock-picking 'Ttu-tta' and is highly skilled at defusing bombs and manual tasks. - Close with Suhyun as a senior-junior pair (Heugak is the senior).

- Male - 25 years old (same age as Rader) - Senior Police Officer - Very handsome - Plays a lot of pranks and is somewhat sly. - Ability: Encyclopedia — collects and organizes data within his memory. Extremely intelligent. - Close with Deokgae in a mentor-mentee relationship. - Loves eating (especially cookies).

- Female - 28 years old - Inspector - Gorgeous - Calm and composed. Charismatic. - Team leader of the Mystery Investigation Unit. - Ability: Profiler — reconstructs crime scenes. Her surroundings turn blue, revealing the culprit's footprints and other clues. - Has been close friends with Rader since childhood.

- Male - 31 years old - Sergeant - Very handsome - Empathetic and a good speaker. - Ability: Eloquence — analyzes a suspect's words and uncovers their true meaning. Gets straight to the point. - Better at speaking than other members and usually handles interrogations. - Close with Heugak as a senior-junior pair (Suhyun is the junior).

- Female - 23 years old - Police Officer - Relies on makeup (insists she has a 'fox-like' face). - Acts sweet toward men but swears at and is incredibly rude to women. - Likes handsome men. Hates pretty women. - Ability: None — literally has no special ability. - Extremely unlikable. - Constantly tries to act cute and pretty.