A guy who's obsessed with girls. He's the protagonist who was having a boring weekend when he received a call from La-chan, a former middle school classmate. The call was about holding a reunion for their old class. Bacon immediately steals his mother 'Amie-con's' car (...) to go to the reunion. His role in the Mafia game is the Cop. Room number 1. Male.

A female character with long hair wearing a pink beanie. She seems to have been quiet during middle school. However, after inheriting her parents' company and becoming wealthy, she organizes a reunion at Deongdeuk Park campsite. When night falls, she suggests playing a game of Mafia. Looking at most of her dialogue after the game starts, she appears to be quite mentally fragile. She is a Citizen. She is the host of this game. She organized this game because she was bullied by Sera in middle school while the rest of the class ignored it. Room number 8. Female.

A female character with gray hair. She is hostile toward her father, who abused her when she was young. Even without knowing that, she has a cold personality. She bullied La-chan in middle school. She was ostracized during her school days because of her poor family situation. She created an SOS signal called 'Sandcastle' with Luke. She is a Mafia. Female. Room number 3.

A male character wearing a hat and sunglasses with a bright personality. When La-chan suggests playing Mafia out of boredom during the reunion, he takes on the role of the moderator. He has excellent athletic ability and very good situational judgment. He teases Sera by calling her 'Ssaebyeora' (Thief-Sera). He has a crush on Sera. He is the Doctor. Male. Room number 6.

A gym-rat male character with blue hair wearing a Valkyrie helmet. Male. Room number 7. Citizen.

A male character with orange hair and glasses. He is always seen with Mocha—or rather, she's the one always clinging to him—and they arrived at the reunion together. However, unlike Mocha who likes him, he doesn't seem to like her much and instead has a crush on Sera. Citizen. Male. Room number 4.

A female character with a brown ponytail and glasses who really likes Karu. However, Karu seems more interested in Sera than her. This is evident from how she shows her dislike whenever Karu mentions Sera. In Mocha's room, there is a broken heart pattern, a chair, and a rope; the broken heart pattern matches the one on Karu's clothes. Female. Room number 5. Citizen.

A male character wearing a cone hat. He is Luyo's younger brother, a late-born child who just graduated from elementary school. According to Luyo, Poyo wouldn't leave his side, so he had no choice but to bring him to the reunion. Citizen. Male. Room number 9.

A male character wearing headphones and a striped shirt. He comes to the reunion with his younger brother, Poyo. Seeing how he cherishes Poyo, the bond between the brothers seems very strong. Mafia. Room number 10. Male.

A male character with brown hair and a black beanie who is a severe smartphone addict. It's said that Rien found him and picked him up while he was walking on the highway staring at his phone to get to the reunion. He claims that despite holding nothing but a phone for over 10 years, his vision is still 20/15. The inside of his room is very strange, filled with drawings of eyes. Room number 2. Male. Citizen.