Kim Seo-jun, a new college student living an ordinary life. Something like a webtoon or web novel happens to him, where he ends up in a different fantasy world. He feels like he has become the main character and is excited for a while, but then a royal murder case occurs before his eyes and Kim Seo-jun is framed as the culprit. As a result, Kim Seo-jun is trapped in Gehenna, a prison in another world. Will he be able to escape this world?