Mi Yan runs a shabby Shunda Express station in Bazhong, eastern Sichuan. With his adoptive father on the brink of death from late-stage cancer and the station facing a violent eviction, the powered-off sorting belt suddenly starts moving by itself, spitting out one piece after another of "interdimensional returns and out-of-time junk."
He signs for defective spirit pills from the cultivation world, discarded medical gel from a high-energy sci-fi world, and a broken forbidden-spell scroll from a world of magic. Mi Yan uses expired gel to save his adoptive father, creating a medical miracle that shocks the country. In the end, he chooses to turn the portal over to Longguo.
After the country's top research teams move in, they not only decipher cross-dimensional technology and laws hidden in the junk from myriad worlds, but also discover an astonishing principle: time flows at different rates in the portals and on Earth. One day on a sci-fi junk planet equals fifteen minutes on Earth, while a century of secluded cultivation in the cultivation world equals one day on Earth.
The country immediately designates the station an S-rank special war-preparation zone. Longguo sells its modern, dirt-cheap instant noodles, sweet potatoes, canned beef, and industrially produced antibiotics to starving scavengers from myriad worlds, impoverished rogue cultivators on the verge of freezing to death, and wasteland survivors.
Longguo's scientists and special forces move straight into other worlds where time flows much faster, using a hundredfold time advantage to launch "cross-dimensional war preparation and super research." When Western powers unite to blockade Longguo and issue a final ultimatum, Longguo has already spent decades developing technology and cultivating in its otherworldly base. On the day the ultimatum expires, only three days have passed in the modern world. Longguo unveils fleets of anti-gravity space carriers combining immortal martial arts and sci-fi technology, crushing the global blockade with overwhelming superiority and leading humanity to victory in a cross-world survival war!
