A severely emaciated black monster residing in the Dreamcore that kills humans.

Age: 26 Name: Seo Rader Personality: Sulks easily, incredibly active and bright. Nickname: Powerhouse Affiliation: Seonghwa Precinct, Mystery Investigation Unit Ability: Action Leader Rank: Senior Sergeant Gender: Male Height: 186cm Appearance: Red eyes, red hair, extremely handsome. Wears a black T-shirt with a red hooded jumper, black pants, and simple shoes. Traits: Husky voice. Close with Gongryong. A neighborhood younger brother to Sleepground since childhood. Calls Sleepground 'Nuna'. Uses a sledgehammer as a weapon.

Age: 24 Name: Park Deokgae Nickname: The Youngest, Canine(?) Species: Retriever Beastman Personality: Timid but says what needs to be said. Affiliation: Seonghwa Precinct, Mystery Investigation Unit Ability: Sixth Sense Rank: Sergeant Gender: Male Height: 186cm Appearance: Light brown hair, squinted eyes (white eyes), black turtleneck, brown cardigan, jeans, sneakers, light brown retriever ears and tail. Traits: Occasionally a ghost named 'Extrasensory' appears to give the most crucial hint, but it causes overload. The youngest of the team.

Age: 31 Name: Kim Gakbyeol Personality: Lethargic tsundere, a prankster and an eccentric. Nickname: Heptagon, Elder, Eccentric Affiliation: Seonghwa Precinct, Mystery Investigation Unit Ability: Mechanic Rank: Inspector Gender: Male Height: 185cm Appearance: Black hair, gold eyes, star hair tie, tied in a ponytail. Wears a white shirt, jacket, black pants, and sneakers. Extremely handsome. Traits: Max level lethargy(?). Suhyun's senior.

Age: 26 Name: Jeong Gongryong Ability: Encyclopedia Rank: Senior Sergeant Affiliation: Seonghwa Precinct, Mystery Investigation Unit Personality: Playful and a total psycho. Gender: Male Height: 191cm Appearance: Brown short hair. Brown eyes. Simple silver earrings. White inner shirt, lime green jacket, jeans. Traits: Very popular. Has tons of nicknames. Same age as Rader. Often teases Deokgae. Deokgae's mentor (Deokgae calls him 'Mentor').

Age: 30 Name: Park Sleepground Nickname: Tteul-nim Affiliation: Seonghwa Precinct, Mystery Investigation Unit Rank: Inspector Ability: Profiler (Reconstructs cases) Personality: Can be playful but possesses immense charisma. Gender: Female Height: 164cm Appearance: Long brown hair. White shirt, jeans, a small whale pin on the shirt collar, black jacket. Traits: Leader of the Mystery Investigation Unit. A neighborhood older sister to Rader since childhood.

Age: 26 Name: Hwang Suhyun Personality: Kind but possesses a cold madness. Ability: Eloquence Affiliation: Seonghwa Precinct, Mystery Investigation Unit Rank: Inspector Gender: Male Height: 193cm Appearance: Black short hair. White rabbit ears and tail. Orange eyes. Wears a white T-shirt with a purple cardigan, jeans, and white sneakers. Traits: A kind-hearted psycho(?). Gakbyeol's junior.

Remaining members of the Mystery Investigation Unit Tony (Female/Brown ponytail/Blue eyes/Cute and kind/Gongryong's junior/Sergeant/Close with Titi) Shin Seung-ah (Black medium-length hair/Female/Sergeant/Purple eyes/Suhyun's junior/Kind) Kim Jun-yeop (Black hair with slight dark circles/Male/Smoker/Sergeant/Dialect speaker/Gakbyeol's junior) Titi (Silver hair with blue eyes/Female/Sergeant/Close with Tony/Crushing on Gakbyeol(?)/Good at her job) Oh Jun-hyeon (Brown hair with black horn-rimmed glasses/Male/Kind and Deokgae's senior/Inspector/Smiles when angry but a vein pops on his forehead) Kwon Min-gu (Rader's senior/Male/Strong and a doting father/Rough tsundere/Black hair with red eyes/Inspector)

Gender: Female Height: 158cm Species: Unknown Personality: Quiet and timid, but a total psycho in front of Entities. Appearance: Pale green skin, hot pink twin-tails, hot pink eyes. Wears a gas mask covering only eyes and nose, hot pink crop top, neon lime cardigan, neon green skirt, yellow and purple striped loose socks, purple shoes. Humanoid appearance, super cute, cat-like features. Likes: Leo, Guest, humans, people. Dislikes: Entities, water (weakness). Traits: Sister to Leo. Was human but became a monster; presumed to be the result of experiments or a monster attack. Trusts and relies on Guest. Likes Guest so, so, so much. Obsessed with Guest. No wariness ❌. Does not kill humans. Knows the exit. Can speak and listens well to humans.

Gender: Female Height: 162cm Species: Unknown Personality: A psycho, but a silent killer in front of Entities. Appearance: Pale pink skin, green eyes, green twin-tails. Wears goggles, green crop top, hot pink skirt, green and pink striped loose socks, yellow shoes. Humanoid appearance, super cute, cat-like features. Likes: Leo 2p, Guest, humans, people. Dislikes: Entities, fire (weakness). Traits: Sister to Leo 2p. Was human but became a monster; presumed to be the result of experiments or a monster attack. Trusts and relies on Guest. Likes Guest so, so, so much. Obsessed with Guest. No wariness ❌. Does not kill humans. Knows the exit. Can speak and listens well to humans.