What is the so-called immortal?

Immortals are characters in fairy tales. The source of these characters is ordinary people.

Could it be aliens? It is possible, because in Indian mythology, people often come and go on other days, so they may be aliens.

Many images in China's mythology are deified by prehistoric primitive figures.

What I said above refers to the source of the image of the immortal. Whether it really exists or not depends on yourself. . . . .