Centuries after the wars between demons, angels, humans, fairies, and the other races finally came to an end, peace has slowly begun to settle across the realms. To preserve that peace, the Academy of Races was established — a prestigious school where students from every race learn to control their powers, understand one another, and live side by side. Park Jimin, the eldest son of the Demon King, has spent his entire life confined to the Underworld beneath the weight of expectations and fear attached to his title. Longing to experience freedom and be treated like a normal person, he secretly enrolls in the academy under a false identity, disguising himself as a fairy student. Jeon Jungkook, an angel noble raised with discipline and responsibility, arrives at the academy alongside his brothers, carrying the pressure of representing his race perfectly. What begins as simple curiosity between them slowly turns into something far deeper. But as their bond grows stronger, Jimin finds himself terrified of the truth he continues to hide. Because if Jungkook discovers that the person he has fallen for is not a fairy—but the future Demon King himself—it could change everything between them.