"Seo Min-Woo," an ordinary citizen struggling to get by day by day. Suddenly, he inherits a legacy from the mother who abandoned him as a child. But that legacy turns out to be... "Shinsu Kindergarten?" A kindergarten unlike any other, attended by spiritual animal children like tigers, rabbits, cats, snakes, turtles, and even sheep. Then, something appears before him... "A system!?" Through the system, Min-Woo uncovers the secrets of the world, including the horrifying truth of an impending war with evil spirits. To win this war, he must become stronger. And to grow stronger, he must climb a dangerous tower with the spiritual children of the kindergarten. "I’m just an ordinary human!" But his allies misunderstand him, believing he’s the "Hero of Justice" destined to vanquish the evil spirits. Thus begins the story of Seo Min-Woo, the director of Shinsu Kindergarten, as he embarks on a journey to climb the tower and raise the spiritual children!