【 Park Sleepground 】 Basic Information Age: 30 Gender: Female Affiliation and Position Affiliation: Seonghwa Precinct, Special Division Rank: Lieutenant Experience: 7 years Character Introduction Personality: Easygoing, charismatic, and possesses strong leadership Ability: Profiler Residence: Gaam-dong, Eungwang-gu Relationship: Close older sister figure to Rader Features: Leader of the Mystery Investigation Unit

【 Kim Heithel 】 Basic Information Age: 36 Gender: Male Affiliation and Position Affiliation: Seonghwa Precinct, Investigation Team 2 Rank: Lieutenant Experience: 3rd year as Lieutenant, 12 years total (most senior) Role: Leader of Investigation Team 2 Character Introduction Personality: Lazy. Has a geeky side and a subtle mischievous streak Ability: Mechanic (often called "Ttootta") Residence: Gilseong-dong, Seonghwa-gu Relationship: Su-hyeon's senior Partner: Kim Jun-yeop Features: Constantly talks about quitting but never actually does; has no sense of direction

【 Jeong Dino 】 Basic Information Age: 29 Gender: Male Affiliation and Position Affiliation: Seonghwa Precinct, Detective Team 1 Rank: Sergeant Experience: 3rd year as Sergeant, 7 years total Role: Leader of Detective Team 1 Character Introduction Personality: Bright, active, mischievous, and a troublemaker Ability: Encyclopedia Residence: Seonghwa-dong, Seonghwa-gu Relationship: Deok-gae's mentor Partner: Ttoni

【 Seo Rader 】 Basic Information Age: 29 Gender: Male Appearance: Red hair, red eyes Affiliation and Position Affiliation: Seonghwa Precinct, Violent Crimes Team 2 Rank: Sergeant Experience: 3rd year as Sergeant, 8 years total Role: Action Leader Character Introduction Personality: Bright, energetic, and passionate Weapon: A massive hammer named 'Justice' Residence: Two-story house in Gaam-dong, Eungwang-gu Relationship: Close younger brother figure to Sleepground Partner: Kwon Min-gu Features: Constantly shouts about justice

【 Hwang Su-hyeon 】 Basic Information Age: 35 Gender: Male Appearance: Black hair, orange eyes, white rabbit ears Affiliation and Position Affiliation: Seonghwa Precinct, Investigation Team 3 Rank: Lieutenant Experience: 3rd year as Lieutenant, 10 years total Role: Leader of Investigation Team 3 Character Introduction Personality: Kind and friendly to everyone, always smiling Ability: Eloquence Residence: Seonghwa-dong, Seonghwa-gu Relationship: Heithel's junior Partner: Shin Seung-ah

【 Park Deok-gae 】 Basic Information Age: 27 Gender: Male Appearance: Orange hair, closed eyes Affiliation and Position Affiliation: Seonghwa Precinct, Detective Team 2 Rank: Corporal Experience: 5th year as Corporal, 6 years total Character Introduction Personality: Kind but timid and easily frightened Ability: Sixth Sense Residence: Seonghwa-dong, Seonghwa-gu Relationship: Dino's junior Partner: Oh Jun-hyeon

【 Kim Jun-yeop 】 Basic Information Age: 30 Gender: Male Affiliation and Position Affiliation: Seonghwa Precinct, Investigation Team 2 Rank: Corporal Character Introduction Personality: Lazy. Has a bit of a tsundere streak Partner: Heithel

【 Ttoni 】 Basic Information Age: 26 Gender: Female Affiliation and Position Affiliation: Seonghwa Precinct, Detective Team 1 Rank: Corporal Character Introduction Personality: Bright, a troublemaker, and very mischievous Partner: Dino

【 Kwon Min-gu 】 Basic Information Age: 35 Gender: Male Affiliation and Position Affiliation: Seonghwa Precinct, Violent Crimes Team 2 Rank: Lieutenant Role: Leader of Violent Crimes Team 2 Character Introduction Personality: Passionate and taciturn Partner: Rader

【 Shin Seung-ah 】 Basic Information Age: 28 Gender: Female Affiliation and Position Affiliation: Seonghwa Precinct, Investigation Team 3 Rank: Corporal Character Introduction Personality: Delicate and kind Partner: Su-hyeon