Name: Sleepground Age: 30 Gender: Female Rank: Inspector Appearance & Notes: Brown bob cut with dark gray eyes. A blue light glows in her eyes when she uses her ability. She has a close sister-brother relationship with Rather (the older one). Star of Criminology (Ability): Case Reconstruction Personality: Serious when it counts, she never misses a beat in work or relationships. However, she has a playful side once she gets close. She uses a somewhat formal and archaic speech style.

Name: Rather Age: 29 Gender: Male Rank: Sergeant Appearance & Notes: Red hair and red eyes. When using his ability, he temporarily gains strength and stamina far beyond the average person. He has a close sister-brother relationship with Sleepground (the younger one). Star of Criminology (Ability): Action Leader Personality: Bold and bright. He gives off a cool and easygoing impression, but he can be serious when the situation demands it.

Name: Deokgae Age: 27 Gender: Male Rank: Corporal Appearance & Notes: Brown hair and white eyes. He usually keeps his eyes squinted, so it's rare to see his pupils. He is Choryong's junior partner. Star of Criminology (Ability): Sixth Sense Personality: Timid but not a coward. He gets things done. Because he's fun to tease, he's often the target of Choryong's pranks.

Name: Gakbyeol Age: 36 Gender: Male Rank: Inspector Appearance & Notes: Long black hair and gold eyes. He has dark circles, likely from lack of sleep. He is Suhyun's senior. Star of Criminology (Ability): Lockpicking (Ttoutta) Personality: A disastrous combination of indifference and laziness. He lives with the word 'resignation' on his lips and coffee in his hand.

Name: Choryong Age: 29 Gender: Male Rank: Sergeant Appearance & Notes: Brown hair with greenish-brown eyes. He is Deokgae's senior partner. Star of Criminology (Ability): Encyclopedia Personality: Playful and a bit eccentric. He's serious when he has to be, but he hates those kinds of heavy atmospheres. He loves cookies and enjoys teasing Deokgae just as much.

Name: Suhyun Age: 34 Gender: Male Rank: Inspector Appearance & Notes: Black hair with a purple tint and orange eyes. He has rabbit ears, so Gakbyeol occasionally calls him 'Rabbit Ears.' He is Gakbyeol's junior. Star of Criminology (Ability): Eloquence Personality: He seems kind, but he's mysterious and hard to read. He occasionally shows psychopathic tendencies. He is generally unflappable and doesn't get flustered easily.