During the Famine Years, the Daughter-In-Law Sold Ten Kilograms of Rice?

[Modern materials and technology are promoted horizontally] In today's society, Lu Liufei, a young man who stayed up late to play King of Kings, died suddenly and unexpectedly. He traveled through another time and space to an ancient dead boy. The poor family had to ask their unmarried daughter-in-law to sell themselves to buy food for the family. Fortunately, the time travel came with a system mall, otherwise it would be impossible to survive. General: Brother Fei, it's bad, the imperial court has sent troops to attack us. Lu Liufei: How many times have I told you to call me bureau seat in the military academy! Say, how many people are there in the court? General: Thirty thousand people have come to the court. Lu Liufei: How many people are there in us? General: Only two hundred thousand... Scout: Master, the enemy is less than fifty miles away from us, what should we do? Lu Liufei: Isn't the range of the cannon just fifty miles? Blast them Enemy: We are less than fifty miles away from each other. Ansai sets up camp and continues to advance tomorrow! Wait, why are meteorites falling from the sky? Prairie people: People from the Central Plains actually dare to compete with us in cavalry? Don't overestimate your capabilities! Wait, what's going on with their iron-like house? How can they run and breathe fire? Tubo: This is a mountainous area, easy to defend and difficult to attack. Let's see how they come up! Wait, what is that thing flying in the sky? Japan: The Central Plains has been in war for many years. It is our opportunity for Japan to march into the Central Plains. This time we lead a fleet of 100 ships and will surely sweep all the ships in the Central Plains! Wait, why did the island move?