Since the old days, mystical creatures have existed to help humans. However, now that the times have changed, they suddenly receive a warning from their god: "Prove that you are still needed". While grappling with how they can assist humans in the modern era, these creatures decide to send their younglings to the human world to seek answers. Meanwhile, university student Park Geuru, who lives his miserable days commuting for five hours to school due to a sudden move, accidentally ends up making a bet with the goblin Sihan... This is a story about the daily life of these young mystical creatures, exploring the human world in order to avoid their own extinction.