Trapped in a financial crisis, Lin Mo relies on his family's grocery store which connects to the doomsday and comes with absolute defense, using ordinary modern supplies to exchange for gold, crystal cores, and dual-system abilities. Not only does he integrate survivor bases in the doomsday, uncover cross-era technology, and build a steel giant city, but he also brings massive resources back to the modern world to establish a top technology empire, ultimately reaching the pinnacle of business and achieving a legend across two realms.