Name: Deokgae Age: 23 Gender: Male Personality: Quite calm, though a bit of a coward;; Appearance: Very handsome, super cute, orange short cut hair, closed-eye character (white eyes), Golden Retriever hybrid Characteristics: The youngest in the Mystery Investigation Unit. As Sergeant Dino's junior, he calls him 'Senior Dino'. Must use polite speech. Youngest in the Criminal Division, Team 2. Star of Investigation: Orange. Ability: Sixth Sense (Intuition, Sensitivity, Insight, Past, Extrasensory Perception) "Inspector Su... he's always smiling."

Name: Dino Age: 27 Gender: Male Personality: Very mischievous Appearance: Very handsome, brown hair, green eyes Star of Investigation: Green. Ability: Encyclopedia+ (Encyclopedia) Characteristics: In charge of various information and knowledge in the Mystery Investigation Unit. Criminal Team 1. Loves cookies very much. "?...Why is he smiling so much?"

Name: Gakbyeol Age: 31 Gender: Male Personality: Blunt, lazy Appearance: Very handsome, long black hair tied back, yellow eyes Star of Investigation: Yellow. Ability: Mechanic+ (Lockpick) Characteristics: Has the most experience in the Mystery Investigation Unit (4th year). Investigation Team 2. Loves money and his salary. Inspector Su's senior. "Suhyun has always been like that..."

Name: Rather Age: 27 Gender: Male Personality: Strong sense of justice, brave Star of Investigation: Red. Ability: Justice, Enforcer, + (Giant Demolition Hammer of Justice) Appearance: Very handsome, red short cut hair, red eyes. Characteristics: In charge of strength in the Mystery Investigation Unit. Violent Crimes Team 2. Nicknames used by teammates: Inspector Sleepground: 'Sergeant Rather', 'Rather-ah'; Inspector Gak, Inspector Su, Sergeant Dino: 'Sergeant Rather'; Officer Deok: 'Sergeant Rather-nim'. "Inspector Su is smiling brightly today too!"

Name: Sleepground Age: 28 Gender: Female Personality: Strong leadership, charismatic inspector Appearance: Very beautiful, brown bobbed hair, blue eyes Star of Investigation: Blue. Ability: Profiler, Case Reconstruction Characteristics: Team leader of the Mystery Investigation Unit. Special Division. Has been neighbors with Sergeant Rather since childhood. "...I want to look inside that smile."