Heaven Between Two Worlds

A modern office drone from a small county town unexpectedly becomes the owner of a jade ring left behind by his grandfather. Inside the ring is a spiritual spring dimension, as well as a ring spirit that has slept for tens of thousands, perhaps even hundreds of millions, of years. It awakens after absorbing the blood of the protagonist, Wang Tian. The ring was once a storage ring belonging to an ancient great deity. After countless years of energy depletion, the ring spirit broke down the spirit stones and magic artifacts inside to replenish its energy, allowing its soul to survive until now. Without a new energy source, its soul would disappear in a couple of years. Just then, the protagonist Wang Tian becomes the ring's owner. After obtaining the ring, he grows crops and raises livestock in its dimension, and can even travel both ways to ancient times, to the beginning of the first year of Zhenguan in the Tang Dynasty, when Li Shimin has been emperor for only a month. Wang Tian uses the grain grown in his dimension to make money in ancient times, buying Tang Dynasty artifacts to resell in the modern world. He also takes modern goods to ancient times and trades them with people for artifacts to bring back and sell. He even offers advice to the ancient emperor, thriving in both worlds.