After being dumped by his girlfriend for being poor, Lin Chuan discovers that a bronze mirror left by his grandfather is connected to an ancient city facing a severe shortage of food and water. A single ordinary lunchbox is something the besieged general is willing to trade gold for. Starting from his very first cross-realm deal, Lin Chuan turns his life around in the modern world while delivering food to save the lives of three thousand people in the city. However, as the business grows larger, people who have set their sights on the bronze mirror also arrive.