In 1620 AD, a construction aid fleet full of engineers, agronomists, doctors and soldiers accidentally broke into a wormhole while crossing the Tsushima Strait and landed in the outer Northeast during the Wanli period of the Ming Dynasty. On the deserted beach of Vladivostok, more than 6,000 modern people started from scratch, building docks, opening coal mines, smelting steel, and making gunpowder, struggling to gain a foothold in the cracks between the Jurchens, Korea, Japan, and the Ming Dynasty. A story that changed the order of the time travel world