She was originally the Goddess of Flowers in the Heavenly Realm. Because she could not bear the three-year drought in the human world, she secretly sent down a sweet rain. However, her memory was buried in dust and she was demoted to the mortal world and became a famous medical saint in the world.
He was originally the god of war in heaven, but he was demoted to earth because of his love. He was willing to fall into the devil's path, vowed to be incompatible with heaven, and began a long journey to find love.
She opened a medical clinic in the human world and met many poor and miserable people, including him.