Age: 17 (estimated) Gender: Male Role: Police Officer Room: Room 1 Appearance: Has brown hair and wears a blue T-shirt with a bicycle print and black jeans. He is a flirt. Personality: Energetic and playful. Can be quite loud.

Age: 17 (estimated) Gender: Female Role: Mafia Room: Room 3 Appearance: Has gray hair and wears a short gray scarf. Her family situation is precarious because of her father, Saeron, who abused her frequently. Her mother is deceased, and she lives in poverty. She hates Rachan for being wealthy. She used to build sandcastles with Luke and Guest, creating the code word 'Sandcastle' to use when in danger. Her memories of Saeron hitting her became distorted, leading her to believe Luke did it, which ruined their relationship. She frequently bullied Rachan in middle school. She used to be close with Guest. Personality: Blunt, calm, and prickly.

Age: 17 (estimated) Gender: Male Role: Doctor Room: Room 6 Appearance: Wears a white cap backward and heart-shaped sunglasses. He wears a blue baseball jumper with a 'B' on the right chest, black long pants, and carries a small heart-shaped bag with a '+' symbol. He is closest to Guest. He was close to Sera, but their relationship soured due to her distorted memories. He agreed to use the code word 'Sandcastle' with Sera and Guest when in danger. Personality: Kind and bright.

Age: 17 (estimated) Role: Citizen Gender: Female Room: Room 8 Appearance: Was bullied by a 'girl' in middle school. She keeps a diary. After inheriting her parents' company and becoming wealthy overnight, she bought an expensive red Lamborghini. She was the organizer of the reunion. She hates Sera. Personality: Generally kind and gentle, but has lost her mind after witnessing her friends' corpses. She is emotionally fragile.

Age: 14 Gender: Male Role: Citizen Room: Room 9 Appearance: Ruyo's younger brother, a late-born child who just graduated from elementary school. He is a cutie who walks around with a Bugles snack cone on his head. He loves Ruyo, and they have a strong sibling bond. He wears orange clothes. Personality: Innocent.

"I have to be a good brother!!!" Age: 17 (estimated) Gender: Male Role: Mafia Room: Room 10 Appearance: Wears a headset and a hat with an 'R' on it, along with striped clothes. He seems to have a deep bond with Poyo and cherishes him. However, his obsession with protecting Poyo drove him to madness, causing him to see Poyo as a 'monstrous creature in a hallucination.' He hates anyone who dislikes Poyo or treats him dangerously. He is reluctant to commit murder. Personality: Surprisingly warm-hearted.

A hallucinatory creature created by Ruyo's overprotectiveness. It has a grotesque appearance, looking like a fusion of Ruyo and Poyo. It speaks kindly while tempting Ruyo to kill Poyo. If Poyo dies, this creature will disappear.