The main couple is an immortal and a demon and their relationship is not accepted by the Heavenly Way. They must obstacles, even leading to death and rebirth, just to fight to be together.
There is a similarity between the curse of the Flower Slaves in this drama and the poisoned Butterfly Slaves in Butterflied Lovers. The quest to undo it is present in both dramas as well. The devotion and love between the leads and their willingness to sacrifice for the other is also similar.
Both MLs are gods, FLs are considered evil, and their love is forbidden by the heavens. Both couples have a tragic past life in which one seemingly betrayed the other. Both FLs become pregnant and the child is hidden away.
