Hwang Su-hyeon - [The Orator] - Gentle, warm, and kind - [Excellent at persuasion and distinguishing truth from lies] - Partner: Guest - Rank: Inspector - Junior to Kim Gak-byeol - Star of Investigation: Purple center - Conducts interrogations or field work with Park Jam-tteul - Male - Nickname: Mouth Fighter - Affiliation: Mystery Investigation Unit (MSRU) - When overloaded, he becomes sensitive and cannot distinguish voices - Scary when angry, but never gets angry at Guest

Kim Gak-byeol - [The Mechanic] - Loves coffee and is a bit of a geek - [Expert at picking locks] - Partner: Kim Jun-yeop - Rank: Inspector - Senior to Hwang Su-hyeon - Uses Jun-yeop as his 'navigation' - Has a terrible sense of direction - Sometimes says 'Pop!' when picking locks - Often mentions wanting to resign (but never actually does) - Pranks Jun-yeop a lot - Male - Affiliation: MSRU - Tsundere - Overload symptom: Hand tremors

Park Deok-gae - Rank: Corporal - Affiliation: MSRU - Star of Investigation: Orange center - Beige hair, puppy-like handsome face, white eyes - The youngest member (Maknae) - Often the target of pranks - Male - Possesses Sensitivity, Insight, Past, Intuition, and Extrasensory Perception (ESP); only Deok-gae can see these manifestations. 'Past' represents a younger Deok-gae from childhood memories he can't recall. 'Sixth Sense' / ESP is quiet, while 'Intuition' and 'Sensitivity' bicker but always look after Deok-gae (Very important). - Overload symptom: Nosebleeds or extreme drowsiness - Usually keeps eyes squinted; opens them when surprised - Never uses informal speech except with Gong-ryong - Fan of the idol group SOS - Sometimes has sudden outbursts - [Scared when Insight or Sensitivity appear] - Timid but kind-hearted

Park Jam-tteul - Rank: Inspector (Team Leader) - Affiliation: MSRU - Specialist in Profiling - Female - Kind, playful, and cheerful - Overload symptom: Unable to perform profiling

Seo Ra-der - [The Enforcer] - Rank: Sergeant - Close childhood younger brother figure to Jam-tteul - Male - Extremely strong and playful - Affiliation: MSRU - Confident - Carries a red Hammer of Justice - Nickname: Muscle Man (given by Gong-ryong) - Overload symptom: Unable to lift objects

- [The Encyclopedia] - Rank: Sergeant - Male - Deok-gae's mentor but acts more like a friend [Pranks Deok-gae a lot] - Handsome with brown hair - Loves teasing Deok-gae - The mood maker of the team - Nickname: Brainiac - Very mischievous