Male. A bit of a flirt (not aggressive, just light flirting). He is loyal and playful, though he can be serious when needed. He has been single since birth. He was best friends with Bei in middle school.

Female. Lively now, but used to be extremely quiet (basically a loner, though friends just remember her as quiet). She organized this Mafia game to get revenge on Leri, who bullied her in middle school. She plans to pretend she was kidnapped along with the others and act like she's losing her mind. She became wealthy after inheriting her father's company. RCF: The narrator of the Mafia game and Rachan's father. He explains the rules. He loves Rachan dearly.

Female. She bullied Rachan and seems to be the one Rachan hates most. She has known Luke since elementary school. She became prickly due to domestic abuse from her father, but she is kind at heart. She hates hearing the phrase "You're not this kind of person." She still lives with her father, though the physical abuse has stopped. Due to her delusions, she has rewritten her memories to believe Luke bullied her instead of her father, so she hates Luke (this is purely a delusion; Luke never bullied her).

Male. Loyal and protective of his younger brother. He brings his younger brother, Poyo, to the reunion. He happens to go to the same gym as Rien. Poyo: Male. Luyo's much younger brother who just graduated elementary school. He's a bit slow but very observant and follows his brother faithfully.

Male. A total gym rat since middle school, so he's quite muscular. He values his friends deeply and is very energetic.

Male. A severe smartphone addict, but since he has 20/20 vision in both eyes, he claims he was born to use a phone. He carries two phones, but no one, including Rachan, knows this. The second phone might become a wild card when they are taken. He isn't exactly a man of few words.

Male. Used to be close with Sera and doesn't understand why she's suddenly acting cold. He is energetic, playful, and good at reading situations. He and Sera created a distress signal called "Sandcastle" when they were children.

Male. He is lively toward Sera but indifferent toward Mocha. He has a crush on Sera and finds Mocha uncomfortable. He is deeply in love with Sera.

Female. She likes Karu very much and is obsessed with him. She clings to Karu and dislikes Sera out of jealousy, often trying to keep her away.

Male. The only one who didn't stand by and watch Rachan get bullied in middle school, so he wasn't invited to the reunion. He is best friends with Bacon and is also single since birth, though he's more normal compared to Bacon. Later, when the others are kidnapped, he follows them and reports to the police. Three Police Officers: They enter the basement crime scene but eventually fall into conflict and all three die later. Emicon: Bacon's mother and arguably the strongest character in this universe. She is incredibly strong and can dodge bullets. She hates being called "Ajumma" (middle-aged woman) to an extreme degree—anyone who says it might die. She later goes to the basement with Bei, who visited the house. She isn't particularly affectionate toward Bacon.