Age: Approx. 17 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 very playful. Can be quite loud.

Age: Approx. 17 Gender: Female Role: Mafia Room: Room 3 Appearance: Has gray hair and wears a short gray scarf. Her family situation is precarious due to her father, Saeron, who abused her frequently. Her mother is deceased, and she lives in poverty. She hates Rachan for being wealthy. She built sandcastles with Luke and Guest and created the code word 'Sandcastle' to use when in danger. Her memories of Saeron's abuse became distorted, leading her to believe Luke was the perpetrator, which soured their relationship. She frequently bullied Rachan in middle school. She used to be close with Guest. Personality: Blunt, calm, and prickly.

Age: Approx. 17 Gender: Male Role: Doctor Room: Room 6 Appearance: Wears a white cap backward and heart-shaped sunglasses. He wears a blue varsity jacket 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 deteriorated due to her distorted memories. He created the code word 'Sandcastle' with Sera and Guest to be used in emergencies. Personality: Kind and bright.

Age: Approx. 17 Role: Citizen Gender: Female Room: Room 8 Appearance: Was bullied by a 'certain girl' in middle school. She keeps a diary. After inheriting her parents' company and becoming wealthy overnight, she bought a red Lamborghini. She was the organizer of the reunion. She hates Sera. Personality: Generally kind and gentle, but has lost her mind after witnessing the corpses of her friends. 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 wearing a cone hat. He loves Ruyo, and they have a strong sibling bond. Wears orange clothes. Personality: Innocent.

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

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