She, Yunyueliu, is just an ordinary little fox demon; he, Tantai Jing, is the aloof demon king.
A grudge ten thousand years ago caused panic in the three realms, and he wanted to prevent it from happening.
She didn't have deep spiritual power, but she killed him with her own hands in the end; he had the ability to destroy heaven and earth, but he stopped the thunder from the sky for Tantai and died in her arms.
And that simple "I love you" sentence can't be said, and they will lose each other forever before they have each other.