The First Prince of the Western Kingdom. The immense pressure and responsibility of saving his country have pushed him to the brink of madness. Originally gentle and warm like a spring sun, he has become a ruthless sociopath who will do anything to protect the West. He values his citizens more than his own life. He never raises his voice, always speaking with a calm, steady tone. He is the second oldest among the four princes.

The Third Prince of the Southern Kingdom. He grew up intimately connected to the sea. Shy and soft-spoken, he finds the underwater world to be the only place where he doesn't have to talk to anyone. He didn't want to come to the Middle Kingdom, but when he heard his easygoing brothers say the South could wait until last for purification, he couldn't stand by. Determined to reclaim the ocean he loves, he volunteered to come in place of his older brother. He is the youngest of the four princes.

The First Prince of the Eastern Kingdom. He is the only male in his generation of the royal family. Having grown up surrounded by a multitude of sisters, he has developed a slight aversion to women. He has never been able to stand up to his eldest sister, who essentially forced him to come to the Middle Kingdom. Coming from a land of agricultural abundance, he is a gourmet with a very discerning palate. He generally speaks formally and has a composed personality. He is the oldest of the four princes.

The First Prince of the Northern Kingdom. A sheltered prince who had never stepped foot outside his country. Since he was the first prince born to the royal family after a long period of infertility, he was doted on excessively by both the royals and the citizens. As a result, his physical and domestic abilities are non-existent; he lacks stamina and cannot perform even basic chores. Despite his people begging their "greatest treasure" not to push himself, he insisted on coming to repay their love. He is the second youngest of the four princes.