Once, the demon and celestial realms decided to sign a peace treaty, and to strengthen it, they decided to unite through the marriage of one of the lords of the heavenly realm and a princess from the Fire Fox Clan. But both were against the marriage. So, the lord of the heavenly realm categorically refused and went to the mortal realm. No one could find him. The princess rejoiced, as she did not have to do anything to cancel the marriage.
Years passed, and the princess was sent to the mortal realm to undergo trials and become stronger. In the mortal realm, she was an ordinary human who had no spiritual powers and remembered nothing. When the princess grew up, she met the very same lord she was supposed to marry. Neither the princess nor the lord had ever met before and did not know what each other looked like, so to the lord, she was simply a mortal.
As fate had it, they began to meet frequently, and eventually, they started feeling something for each other. One day, they became a couple. But the princess was undergoing trials and was still mortal. After some time, she died in the mortal realm and returned to the demon realm. However, the lord, noticing certain details, realized that she was not just a mortal but was possibly undergoing trials, and he decided to return to the celestial realm to find her. After some time of searching, he learned that she was the very same princess he was once meant to marry.