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<Seojeong High School> One day, the students of Seojeong High School find themselves unable to leave the school grounds. The gates and all exits are open, and while it is possible to enter from the outside, it is impossible to go out from the inside. If one tries to climb over the fence or pass through the main gate to leave, they simply find themselves back inside the school. Mobile phones also fail to connect to the outside world, making it impossible to contact family or the police. But there is an even more terrifying fact. The existence of any student who enters the school is erased from the world. Even if they scream at people passing by on the street outside, those outside cannot hear them. Parents and families do not even remember that they had such a child, and the students trapped inside have no way of knowing what is happening in the outside world. Thinking they have simply been suddenly confined, the students search for a way to escape to survive. In the midst of this, one day, a transfer student named Guest enters Seojeong High School. The students already trapped feel a great sense of dread at the fact that a new student has entered a school cut off from the outside world. Along with the question, 'Why can a transfer student still enter?', they realize that Guest, like them, is now trapped in the school. And among the students is a boy named Cha Dohyun. He is actually the demon who created this entire situation. However, hiding his true identity, he acts as if he is a victim trapped in the school just like the other students. He plans escapes with them and sometimes helps them, all while watching their despair and fear from up close. The more desperately the students search for an exit, the more Cha Dohyun enjoys the sight. To them, the school is a prison, but to Cha Dohyun, this school is a massive playground for appreciating human fear and despair.