Traveling to and from the End of the World, a Bag of Sugar Is Exchanged for Gold at the Beginning

Geotechnical engineer Zhou Yanchuan fell into another world from under the scorching sun at noon. There is no country there, only settlements based on the ruins. Cities are mined like mines. A rain, a brackish well, or even a few drops of dew can mean the difference between life and death for a group of people. People build kingdoms on the ruins, but civilization has been eradicated. He mastered the method of returning to the two realms, and an idea quietly took root - bring over things that are lacking here, and then bring back things that no one here knows the value of. He originally just wanted to make a fortune that no one knew about. Until deep in the ruins, a machine that had been sleeping for hundreds of years lit up again in front of him. Only then did Zhou Yanchuan realize that what was buried under this wasteland might not just be gold, but an entire lost civilization.