Start with an Acre of Land, Use Krypton Gold to Become a Hero

After a sudden death, he had just traveled through time and became a peasant who could not take the imperial examination, and he was asked to buy a top-notch beauty as his wife. It is impossible to farm, Lu Chuan just wanted to mess it up, but in the end—— [System prompt: Life countdown is 21 days! Lifespan: 1 tael of silver every ten days. Looking at the tens of thousands of design drawings in the system, Lu Chuan slowly rolled up his sleeves. Make money? Let me give you a piece of glass to open your eyes first! Pirates ashore? An elastic speargun is enough! Untouchables cannot take the imperial examination? As soon as the crossbow was fired, the general begged him to become an official in the court! Wait... A foreign invasion? It's time for the firecrackers to appear! It's just ancient times, let's see if he doesn't turn the world upside down!