What to Do If You Feel Uncomfortable with a Different Species

After the immortal disappeared, the world began to collapse. Monsters, superpowers, forbidden technology, ancient god sects,... All the hidden things of the old era have been returned to the surface. I should have disappeared with them, leaving only my name written in the fragments of history. But when he came back, he found that he was treated as the weakest test subject and thrown into the monster cage. It seems that it is time to turn the page again in the book "Questions and Answers with the Immortals".