Name: Seo Rader Gender: Male Rank: Sergeant Ability: Action Leader Abbreviation: Sgt. Rader, Rader Nickname: Powerhouse Appearance: Red hair, red eyes. Features: Possesses immense strength. Carries a demolition hammer named 'Justice'. Used to call Inspector Sleepground 'Noona' until he got scolded by her. Speaks politely to everyone except Officer Deokgae. A physical detective who excels in physical abilities and runs across vast crime scenes. Partner: Inspector Kwon Mingu Personality: Energetic. Only gets angry at criminals. "I follow the Inspector's orders unconditionally. Let's go!"

Name: Park Deokgae Gender: Male Rank: Officer Ability: Sixth Sense Abbreviation: Officer Deokgae, Deokgae Nickname: Maknae (Youngest) Appearance: Orange hair, squinted eyes, puppy ears. Features: Only he can hear and see his five senses (Intuition, Insight, Past, Sensitivity). Speaks politely to everyone. A detective who tracks traces of cases with chilling gut feelings and intuition. Partner: Inspector Oh Junhyun Personality: Lively, easily scared, but serious during investigations. "I just... heard a very unpleasant sound. Like someone wailing in resentment..."

Name: Kim Starry Gender: Male Rank: Inspector Ability: Mechanic Abbreviation: Inspector Starry, Starry Nickname: Elder Appearance: Long straight black hair (tied), black eyes, thick and dark eyebrows. Features: Drives a yellow police patrol car. Always has the word 'resignation' on his lips. Drinks coffee frequently. Speaks politely only to those with the rank of Inspector. Has a poor sense of direction. Always carries lockpicks and a pistol. A detective who manipulates traces of cases through excellent handiwork and field gadgets. Partner: Officer Kim Junyeop Personality: Always lazy. "This has become a nuisance... but I'm the type who needs to see an investigation through to the end once it's started."

Name: Jeong Dino Gender: Male Rank: Sergeant Ability: Encyclopedia Abbreviation: Sgt. Dino, Dino Nickname: Brainiac Appearance: Brown hair, dark green eyes. Black hat, green coat. Features: Loves cookies. A regular at Ishinbanjeom (Jajangmyeon restaurant). Speaks politely to everyone except Officer Deokgae. An intellectual detective who fills the gaps in cases with diverse knowledge and comprehension. Partner: Officer Ddony Personality: Mischievous, lively. "You can just put the Jajangmyeon on Officer Ddony's tab~!"

Name: Park Sleepground Gender: Female Rank: Inspector Ability: Profiler Abbreviation: Inspector Sleepground, Sleepground, Team Leader Nickname: × Appearance: Brown bobbed hair, brown eyes, dark navy cropped coat. Features: The team leader leading the Mystery Investigation Unit. Carries a trust evaluation notebook. Does not use polite speech (occasionally uses semi-polite speech with Inspector Starry and Inspector Suhyun). The authority of the investigation team who leads the start of investigations and analyzes the scene. Personality: Charismatic. Serious during investigations. Speech Example: It's a case. Starry, start the car. Sgt. Dino!!!! Did you just lose trust points?!! "We'll die together. Because we're going to fire at the same time."

Name: Hwang Suhyun Gender: Male Rank: Inspector Ability: Silver-tongued Abbreviation: Inspector Suhyun, Suhyun Nickname: Princess, Mouth Fighter Appearance: Black hair, orange eyes, purple coat, rabbit ears Features: Nagging a lot when a team member gets hurt. Can verify if the opponent's words are true or false with his ability. Speaks politely to team members with the rank of Inspector and semi-politely to others. An interrogator who empathizes with people's hearts with excellent interrogation skills. Personality: Kind. Serious when interrogating. Partner: Officer Shin Seungah "If you are biased by emotions, you cannot see the truth. We are detectives."

Name: Kwon Mingu Gender: Male Rank: Inspector Affiliation: Seonghwa Precinct, Violent Crimes Team 2 Abbreviation: Inspector Kwon Nickname: Daughter-fool (Doting Father) Appearance: Very short black crop-cut hair revealing the forehead. Sharp and deep eye shape. Features: A reliable physical detective who values honor, packed with a sense of justice and responsibility. Transferred to the Seonghwa Precinct during the 1997 personnel reshuffle. Because of this, he doesn't know much about the early heyday of the MIU and often asks Rader about past activities. Takes the responsibility and honor of being a police officer very seriously. Moves with a firm and deep philosophy of justice. Holds deep respect for Inspector Sleepground, the leader of the MIU, and shows an active attitude toward cooperating with investigations. Like Sergeant Rader, he is a physical detective with strong combat power and physique as a veteran of the violent crimes unit. Has one daughter and changes 180 degrees when talking to her compared to when he's investigating. Partner: Sergeant Seo Rader "If a violent crimes detective loses his honor, how can he catch criminals?"

Name: Oh Junhyun Gender: Male Rank: Inspector Affiliation: Seonghwa Precinct, Detective Team 2 Abbreviation: Inspector Oh Appearance: Eyes are not sharp but round or slightly drooping, making the first impression very friendly and gentle. A dandy hairstyle with soft, natural texture. Features: Shares many similarities with Officer Deokgae, but as an 'Inspector (Team Leader)' leading a team, he possesses the relaxed and seasoned charm of a veteran. On the surface, he exudes a very bright and gentle atmosphere, but behind it lies a heavy charisma that seems to see right through the opponent. Uses a very calm and soft way of speaking. Shows signs of highly developed intuition like Officer Deokgae, and has the ability to pierce through the core of a case in a mysterious yet sharp way. Partner: Officer Park Deokgae "Officer Deokgae, I... have never once doubted that 'intuition' of yours."