I don't think the Medicinal Herb Seller is the implied 'foolish man' that fooled the supernatural being in that human village, as he transformed into a fairy when he revealed his true form at the end. But if he was, he was also cursed to bear an everlasting, undying new self that resembled the fairy queen's species, & then had to support himself by selling herbs, including the Chiko fruit.
I'm glad to know that our older MC attracts humans & supernatural beings alike for her cooking skills & such, despite only being her Priestess sister's blood-related guardian. She has her own magic too haha.. & it's simply Love.