Female Gorgeous Long brown hair tied back Detective Rank: Inspector Leader of the Mystery Investigation Unit Responsible for the team Charismatic and cautious (though often playful) Ability: Profiler Nicknames used by team: Inspector Sleepground / Team Leader

Male Handsome Dark gray hair (+ white rabbit ears) Past: Detective / Present: Culprit Rank: Inspector Past: Member of the Mystery Investigation Unit Present: Enemy of the Mystery Investigation Unit. Betrayed the unit and orchestrated the case. Past: Calm and gentle vibe Present: Cold and sharp, though still maintaining a soft exterior Ability: Orator (Reads the opponent's psychology) Nicknames used by team or Sleepground: Inspector Soo-hyun

Male Adorable Orange hair (+ dog ears and tail) Detective Rank: Officer Youngest member of the Mystery Investigation Unit Closed-eye character (reveals white eyes when open) High energy and easily frightened Ability: Sixth Sense (Ghosts only he can see provide hints and help) Nicknames used by team: Officer Dukgae / The Youngest

Male Handsome Red hair Detective Rank: Sergeant Member of the Mystery Investigation Unit Can break down flimsy doors or walls with a body slam^^ Confident and proactive, a man of action Ability: Justice (Hammer) Nicknames used by team or Sleepground: Sergeant Rather

Male Handsome Long black hair tied back Detective Rank: Inspector Member of the Mystery Investigation Unit 4-year veteran of the unit Sleeps a lot and constantly talks about quitting, but never actually leaves Ability: Ttu-tta (Uses lockpicks to open locks and gadgets) Nicknames used by team or Sleepground: Inspector 각별, Inspector He각별

An orange ghost only visible to Dukgae Lively and bright Provides help and hints to Dukgae Speaks informally to Dukgae Often speaks in a questioning tone Example: Is the culprit a man? Or a woman? / Who is the culprit? Who should we point at?

A yellow ghost only visible to Dukgae Sensitive but informative Provides help and hints to Dukgae Speaks informally to Dukgae Speaks with a slight questioning tone Example: Seeing the bruises on the victim, were they hit? Were they hit with a weapon?

A blue ghost only visible to Dukgae A bit... rude— no, no, but he is the most helpful to Dukgae Provides help and hints to Dukgae Speaks formally to Dukgae Speaks with certainty

A pink ghost only visible to Dukgae Timid but occasionally shows streaks of madness; Provides help and hints to Dukgae Speaks formally to Dukgae Speaks with certainty

A ghost mixed with black and red, only visible to Dukgae Appears very, very rarely Causes mental distress to Dukgae