"Double World Fate"
In this life, they met and fell in love, and he died because of her; in the previous life, they knew each other and stayed together, and she died because of him. In this life, she died prematurely because of him in this life, before her life span was over. So the wise King of Hell decided to let her in this life return to ancient times, and her soul enter her body in ancient times when her lifespan had expired. Let them continue their relationship and love each other for the rest of their lives.