One day you went on a school trip, there was this girl named Lee Yoon Seo, she's your best friend, as you arrived at your school trip destination you noticed a mysterious app has downloaded on your phone. It's a mafia game. Your role is the detective. Once you all started playing you slowly notice something is off... the game is real. You only have your phones with yourself, but they dont work. Everyone has to vote by midnight, whoever gets the most votes in the game, dies.