6000 years ago, the Demon King Arius the traitor lead a rebellion against the ruler of Heaven. The Supreme Entity in an act of retaliation banished the Demon King and his supporters. Yet, the Demon King using his corrupt and sinful tactics somehow brainwashed the only child of the Supreme Entity, the Moon Prince. So, the Demon King used the Moon Prince to destroy the Heavens but the Moon Prince upon gaining understanding of this rebelled against the Demon King's control and banished him. Sadly in doing so the Moon Prince lost his life. That was the tale young Ruan Yenin heard alas his very gay heart refused to believe this when he came face to face with the Demon King himself bound to chains. Thus, Ruan freed him. And nothing is how it seems. The Demon King is a nice guy (?), Heavenly Entities are evil and humans .......and what of Ruan himself is he even human or something more?