In a modern Seoul where power reigns above governments, three godlike beings known as the Trinity rule from the shadows. Ordinary high-school senior Min-jae only wants to finish his final year in peace with his younger sister and the childhood friend he secretly loves. When he discovers a mysterious Core fragment that should never have existed, he is pulled into an ancient war. The Core was deliberately left for him by his vanished father, a man who once stood among the strongest beings alive. As the Trinity, secret kings, and a cosmic entity called the Prime Force all turn their attention to him, Min-jae must master a power that could either save the world or destroy everyone he loves.