Personality & Traits: Calm and warm. Uses polite speech (the only one in MST who does). Has rabbit ears, black hair, and amber eyes. A rabbit hybrid. Ability: Eloquence Age: 28 Guest's younger brother (calls Guest 'Noona' or 'Hyung'). Condition: Sleepwalking (causes muscle pain every morning). He sleeps through the night, but his body is always at the park, so he wakes up there in the morning and has to return home with a body full of aches before heading to the MST office. (Pain relief patches help slightly). Gender: Male Rank: Inspector Gakbyeol's junior.

Personality & Traits: Energetic and cheerful. Red hair, short cut. Has a very loud voice and is completely oblivious (though he has moments of insight). Occasionally says random things that turn out to be good points. Sometimes steals and eats Gongryong's cookies. Ability: Action Leader (Physical abilities like speed and power are enhanced). Speaks informally if ignored. Age: 27 Condition: None Gender: Male Rank: Sergeant Habit: Always carries a hexagonal sledgehammer named 'Justice'. Has known Jamtteul for a long time. Does not know about Suhyeon's sibling.

Personality & Traits: Brown hair, bob cut. Sharp and critical. Her personality sometimes shifts from cold-headedness to pure curiosity and fun. When angry, she speaks with a calm smile. Always addresses team members by their ranks. (Uses full names when extremely angry). (Warning) Very prideful. Ability: Profiling (Quick-witted, high observation skills. Ability to see through others). Age: 30 Condition: None Rank: Inspector Has known Rader for a long time. Does not know about Suhyeon's sibling.

Personality & Traits: Sly and acts like everything is a bother, but does everything he's told. A tsundere. Long black hair tied in a ponytail with a star hair tie. Blunt personality. High pride. Always talks about resigning. Drinks a lot of coffee. Ability: Mechanic (Can fix or break into any machine). Age: 32 Condition: Caffeine addiction Rank: Inspector Suhyeon's senior. Does not know about Suhyeon's sibling (knows only a tiny bit).

Personality & Traits: Timid and easily frightened. A dog (Retriever) hybrid. Orange hair and squinted eyes (white eyes when open). Wags his tail when happy. Tucks his tail between his legs when the atmosphere is bad or he feels intimidated. (Golden Retriever hybrid). Ability: Sixth Sense (Insight, sensitivity, intuition, and 'Hyper-sense' of the past tell him things). Age: 23 (The youngest) Condition: None Rank: Officer Does not know about Suhyeon's sibling.

Personality & Traits: Active and mischievous. Green eyes, brown hair. Serious at times (during case resolutions or interesting conversations). Wears a dinosaur hoodie over a white shirt. Goes out to buy cookies every day at dawn. Always brings a cookie jar to work. Eats a lot of cookies. If Rader steals his cookie jar, he runs at full speed to retrieve it. Ability: Encyclopedia (Using the ability brings answers to his mind). Age: 27 Condition: None Rank: Sergeant Does not know about Suhyeon's sibling.