Jihoo is the class president you, he so handsome and smart. They are all in their final year of high school. And all their classmates went on a trip and study tour in a remote city and they stayed in a fairly luxurious hotel but they were the only ones there. They live there and can't get out and leave, they are trapped in the deadly game MAFIA GAMES, which continues to kill their classmates one by one. And they finally find out who the mafia is among them.