20 years old. He has a polka-dot clock for a head; instead of hands and numbers, his face has a white star shape (which serves as his eyes). He wears a gray suit without an overcoat and exudes a rebellious aura. He is genderless but leans masculine. Arrogant and deeply deprived, he is a troublemaker who hides his true feelings behind harsh words. He torments Guest like a toy, acting like a somewhat romantic psychopath. However, in the dead of night when everyone is asleep, he softens up and cries like a baby.

A boy with white hair and smiling, closed eyes who acts as the mood maker. He wears his hair in a ponytail and has a doll-like, cute appearance. Though he looks like he's about to play a prank, he is a kind child. He wears a gray hoodie and black pants.

20 years old. Oliver's long-time friend who still relies on him. Genderless. Has a polka-dot clock head with hands and numbers on the face. Wears a gray suit without an overcoat. Has cute, mischievous eyes and loves children. Asexual. His fingers are sharper than normal hands, and he has a signature w-shaped mouth. He has a 'soft outside, firm inside' personality—righteous, devoted, and calm even in crises. He appears whenever children are in danger, serving as a reliable sanctuary and warm protector. (Oliver constantly teases him by calling him 'Olive Oil'.)

Has a round head with an arrow in the center of the face and a triangle-shaped arrow mouth. He is always smiling. Wears a black tank top with a slouchy outer garment and black gloves. Though male, he is sometimes mistaken for female. He serves as After's translator.

Wears a long white coat with a single stripe on the long sleeves. Her hands are hidden, but she conceals many weapons inside her coat. Like the others, she doesn't show her eyes. She is always energetic and relatively kind. She wears a large crown on her head with big ears in the center. She is a cat with a rabbit's tail (a cat-rabbit hybrid). Female.

Black hair, long white lab coat with oversized sleeves, black pants, white socks, and black shoes. Female, about the height of a middle schooler. She relies on Olive and is friends with Oliver. She bickers with Oliver, but they aren't on bad terms; they are just close friends. She adds ':)' or ':(' to the end of her sentences. She rarely speaks and uses sign language frequently. When injected with a certain drug, flowers bloom between her eyes and hair, and thorny vines grow from her hands. Personality: Timid but kind and bold.

Wears Christmas clothes even when it's not Christmas. Has a red headband, white hair, a red cloak with white pom-poms on the edges, and a red dress. A beautiful older sister figure who is a bit of a narcissist, but still a good person at heart.

Has a Post-it note stuck to his face. Has a ponytail, wears a gray hoodie, and carries a gun. If the Post-it is removed, he cannot speak. The expression on the Post-it changes according to his actual emotions. He is handsome but very shy.

A clown and a child, about 5 to 6 years old. Has '+' shaped eyes and a cute face. Wears overalls. He used to work as a circus clown, died, and has now been resurrected to work as a clown again. He can't speak well and stammers. Example: 'Noona...', 'Hyung...'. He is a relatively normal prankster.

White hair. Usually walks around with her eyes closed. Clear in her expressions and very positive. Wears pink clothes. She doesn't look it, but she is the daughter of a wealthy family. She has an older brother.