Lin Yuan, a third-rate foreign trader, accidentally obtained a cross-time and space trading system, which allows him to resell materials between modern cities, doomsday wastelands, and the world of immortality. A pound of refined salt is exchanged for doomsday gold, a box of antibiotics is exchanged for immortal spiritual stones, and a mobile phone makes a saint from another world fall in love... When he thought this was just a get-rich-quick game, he discovered that the crises in the three worlds were converging. The wasteland virus quietly invaded the city, and the immortal cultivator set his sights on modern technology, and he himself became the "key" hunted by all forces.
