Heavily in debt, couple Li Mei and Zhou Erqiang drive their semi-trailer into a mysterious time-portal tunnel, stepping on the gas only to burst onto a drought-stricken ancient border. With an army of 500,000 starving and dying of thirst, the watermelons in their truck become life-saving treasures! Even better, the tunnel allows round trips! Hauling water, delivering food, drilling wells, building roads, and transporting farm machinery for infrastructure, the couple originally only wanted to pay off their truck loan. Instead, they turn it into an exclusive cross-era business, transforming a desolate frontier into a prosperous land. From harassed truck drivers to a prince and princess, this haul completely changes their fate!