She is the Demon Realm's Sovereign. Her deeds are brutal, but she is willing to give up her throne for one person.
He is the Demon King's counterpart in the Yao Realm, carefree and irreverent, but he is willing to sever his ties with the Yao Realm for one person.
The Yao and demon realms have been at war since ancient times. Never before have two of their people fallen in love.
Through their battles, they come to love one another, and to kill one another.
She is subjected to the Immortal Execution,
while his Yao form is cut away.
From then on, there is no longer a brutal sovereign of the Demon Realm, nor a carefree king of the Yao Realm.
