I Sold Pickled Mustard in Ancient Times, and the Prince Ordered Takeout Every Day.

Desperate, Lin Mo accidentally binds a door that can travel back and forth between the two worlds. When a bag of refined salt can exchange the lives of ten families of refugees... When a box of antibiotics is worth a city... When the torrent of millions of steel armors rolls over the border... When the first steam locomotive roared through the morning fog... The heroes of the old era collapsed in shock, and the prologue of the new era stretched on the railway tracks. "It's time to change the way we live in this world."