Rise of the Demon God - Chapter 13 - 13 : Perfect Plan?

In the legends that were told, ten thousand years ago the twelve demon kings wreaked havoc upon the world, almost completely destroying it. Ten thousand years later, the late arriving Bella discovered that she had been screwed over by her reincarnation, the ranks of the Saviors are already filled and she has to change teams in order to pass the days. Having her gender changed into a beautiful girl… she endured that, not being able to join the righteous side and obtain cheat abilities… she endured, but what she could not endure, was that the world that she had transmigrated to was toxic beyond belief. No one here does their rightful jobs properly, be they heroes, demon kings, or creator gods… in fact, Bella felt as if they all had also started with the wrong faction!

The mountain village boy accidentally got the fairy gourd, and he rose step by step to cultivate immortality and longevity.

Ripe elixir, mortal flow.

- Description from novelbuddy

Su Bai, a novelist from Earth accidentally fell from the top of a cliff.When he woke up, he realised he had already transmigrated to another world. Furthermore, this was not just any world. It was a primitive other world with Humanoids.With his Daily Assistance System and extensive knowledge from modem society, some of which he learnt from being an author, he led his primitive Tribe out of poverty. There, little by little, he started to transform the era, to advance it forward!Uncovering mysterious of Shamans! Meeting more beast eared women! Farming!

Lin Jie, a transmigrator, is the owner of a bookstore in another world.