According to legend since ancient times, the world is divided into four realms, the human realm, the heaven realm, the underworld, and the demon realm.
The heaven and the underworld are the ancient upper realms. During this period, countless monks from the human world practiced and ascended to the two realms. The human realm was the most prosperous and lively realm, and it was also the realm with the largest number of immortal cultivators. Among them, there were many who could have ascended to the ancient upper realm but did not ascend because of nostalgia for the world. Immortal cultivators, and the Demon Realm is the realm where all living beings practice. Relatively speaking, the strength of the four realms is almost the same, but the ethereal fairyland and purgatory that are widely spread outside the four realms are more fascinating. However, no one has ever revealed any news about them, and only a few words have been circulated to the world.
And our story begins in the noisy and bustling world of people.