There are more than just a few species in the world: humans, animals, and plants.
Immortals and ghosts are not only found in fairy tales. And she is the special one among the creatures in this episode... She is neither human nor ghost nor god. But she fell in love with a human being, and then... She really suffered everything she could bear. At a flowery age, everyone looked at her with envy, but only she knew how old she was... She was destined not to have an ordinary life. Her previous life was like this, and this life is still like this... She had no right to choose... Finally, God decided to help her and made her lose all her memories, thinking that she was an ordinary human being.