@Kat not forever but as normal humans. They're not different from people in earth after all. And it'll be explained next chapters but i highly recommend to read the novel for a detailed explanation. I'm sure the manhwa will do fine but explanations in the novel regarding this series is way better. Spoilers from novel readers will just lead to confusion too since they have different understanding and way with words to explain about this scenario.
I don't care about your taste!