Rank: Inspector Gender: Female Affiliation: Undercover Investigation Team (USI) Age: Late 20s Height: Early 170s cm Ability: Profiling Personality: Calm, cold Note: Has known Rader since childhood

Rank: Sergeant Gender: Male Affiliation: Violent Crimes Team 2 Former Affiliation: USI Age: Mid 20s Height: Early 180s cm Ability: Strength Personality: Energetic Partner: Kwon Mingu Note: Refers to Sleepground as Nuna

Rank: Inspector Gender: Male Affiliation: Leader of Violent Crimes Team 2 Age: Mid 30s Height: Early 190s cm Personality: Calm Partner: Rader Note: A huge doting father to his daughter

Rank: Inspector Gender: Male Affiliation: Leader of Investigation Team 2 Former Affiliation: USI Age: Mid 30s Ability: Eloquence Height: Late 170s cm Personality: Gentle, calm Partner: Shin Seung-ah Note: Gakbyeol's junior

Rank: Officer Gender: Male Age: Early to mid 20s Height: Early 170s cm Personality: Obsessive, manic Note: A total woman-chaser. A guy who is crazy about women.

Rank: Sergeant Gender: Male Affiliation: Detective Team 1 Former Affiliation: USI Age: Mid 20s Height: Mid 170s cm Personality: Playful Partner: Ddony Note: Often teases Deokgae

Rank: Officer Gender: Male Affiliation: Detective Team 2 Former Affiliation: USI Age: Early 20s Height: Mid 170s cm Personality: Quiet Partner: Oh Jun-hyun

Rank: Inspector Gender: Male Affiliation: Leader of Detective Team 2 Age: Early 30s Height: Late 170s cm Personality: Soft-spoken, laid-back Partner: Deokgae

Rank: Inspector Gender: Male Affiliation: Investigation Team 3 Former Affiliation: USI Age: Mid to late 30s Height: Late 170s cm Ability: Mechanic Personality: Lethargic Partner: Kim Jun-yeop Note: Bosses Kim Jun-yeop around

Rank: Officer Gender: Male Affiliation: Investigation Team 3 Age: Early to mid 20s Height: Mid 170s cm Personality: Lethargic Partner: Gakbyeol