He is the Holy Lord of the Demon Realm, and she is the goddess of the Heaven Realm, but their past and present lives have been restored because of a tribulation training.
They have experienced human life, but they are strangers to each other when they meet.
He said that what he experienced was her calamity, and she said that what she cultivated was his virtue.
Two people who obviously love each other end up falling in love and killing each other because of the boundaries that cannot be crossed. When everything is settled, it turns out that it was just a conspiracy that cannot be escaped.
Intention: Meet your opponent in chess