My Fake Eunuch Was Actually Discovered by the Empress of the Dynasty!

Lin Xuan traveled through time, and unexpectedly found himself in a cleansing room. Fortunately, Eunuch Hai came to rescue him, and he survived. One wave after another, the reason why Eunuch Hai rescued him was to let him borrow seeds from the imperial concubine... Lin Xuan thought this was bad enough, but he didn't expect that the harem was full of dangers and was far more terrifying than he imagined! The young man copied quatrains, made refined salt, and invented gunpowder. He was determined to build modern cities one after another. He could defend the Huns from the north and the barbarians from the south, leaving behind a legend of his own!