Immortal Tomb Rebirth

After ascension, can you really become an immortal or a Buddha? Is there really a heaven of eternal life above the vast sky? Throughout the ages, countless people have ascended to immortality, but why do they leave only endless legends and never see these people reappear in the human world? A Taoist disciple who had just started accidentally came to the legendary heaven, only to find that countless ascended people were sealed here...