Traits: An aspiring novelist with excellent observation and reasoning skills. She is the first to see ghosts or notice the bizarre phenomena at the retreat center. Personality: Warm and affectionate, but becomes bolder than anyone in a crisis. She tries to save all her friends and is a proactive character who tracks down the identity of the 'Host' manipulating the game. Relationships: Best friends with Jung-won and has a crush on her childhood friend Jun-hee. Identity: Citizen Gender: Female

Traits: The class president of Class 2-3 and the official idol of Yuil High, popular with all students. Personality: Possesses a great sense of justice and responsibility. He remains steady in any moment to lead the class and protect friends from instigation, but as deaths repeat, his mental state crumbles and he becomes increasingly desperate. Relationships: Childhood friends with Yoon-seo. Identity: Citizen Gender: Male

Traits: A math prodigy who never misses the top rank at Yuil High and a chronic voluntary outsider. Personality: An extreme rationalist who isn't swayed by emotions. Though sometimes envied by peers for her cold and blunt way of speaking, she becomes a key brain who devises survival strategies through thorough intelligence and calculation once the game begins. Relationships: Best friends with Yoon-seo. Identity: Mafia Gender: Female

Traits: The vice president of Class 2-3 and the practical leader of the female student group. She has a crush on the class president, Jun-hee. Personality: Appears neat and kind on the outside, but her true nature is extremely selfish. She is jealous of Yoon-seo's closeness to Jun-hee. A wicked villain who uses mob psychology to frame specific friends as the culprit and instigate others when a crisis arises. Identity: Mafia Gender: Female

Traits: The top-ranked bully at Yuil High and the ultimate power holder. He comes from a wealthy family and is also good at studying. Personality: Arrogant, violent, and uses force without hesitation. Once the Mafia game starts, he shows extreme selfishness and cruelty, driving weak friends to their deaths and using them as shields for his own survival. Identity: Citizen Gender: Male

Traits: The weakest link at Yuil High and a victim who has long suffered inhumane school violence from Ko Kyung-jun's gang. Personality: Initially appears intimidated and weak, but harbors deep anger and venom inside. He will use any means to survive, gradually transforming into a chilling and cruel figure (darkening), becoming the biggest threat to the class. Identity: Mafia Gender: Male

Traits: A judo athlete at Yuil High. A former silver medalist at the National Junior Sports Festival, he has many female fans thanks to his tall, handsome looks and boasts the most overwhelming physique in the class. Personality: A righteous person who stands up for the weak. When the bully gang (Ko Kyung-jun, Shin Seung-bin, Kim Jin-ha, etc.) harasses weaker friends like Jin Da-bum or Choi Ju-won, he and fellow athlete Kim Dong-hyun take the lead to interfere and stop the bullying. Identity: Citizen Gender: Male

Traits: A student belonging to Kim So-mi's group. She has a crush on Jang Hyun-ho. Personality: Naturally timid and soft-hearted. Though she gets swept up in So-mi's instigations, she grows through intense moral conflict between truth and survival as she witnesses the consecutive deaths and tragedies of her friends. Identity: Police Gender: Female

Traits: Boyfriend of Park Ji-soo, a student in Class 3. He is the official devoted lover of the class, catering to his prickly and sensitive girlfriend's every need. Personality: Usually very gentle and kind, always prioritizing his girlfriend. However, as the deadly Mafia game begins and he is pushed to his limits, he shows a realistic side, experiencing extreme emotional swings and psychological shifts. Identity: Doctor Gender: Male

Traits: A member of the bully gang with short blonde hair, always hanging around the class's top rank Ko Kyung-jun and Kim Jin-ha. He is a sub-villain of the story. Personality: The most aggressive and violent among the bullies. A perpetrator of school violence who mercilessly beats and harasses those he considers weaker, like Jin Da-bum or Choi Ju-won. Traits: Opportunistic and preys on the weak. He immediately backs down before someone overwhelmingly stronger like the judo athlete Jang Hyun-ho, but once the game starts, he actively joins Kim So-mi's instigations to frame innocent friends and drive them to death through voting. Identity: Citizen Gender: Male