Why Is My Count's Domain Full of Troublemakers?

Yang Zongan, a transmigrator from Blue Star, awakened memories of his past life at eighteen. The good news: he was the empire's youngest earl, with a fief of 42,000 people. The bad news: he was frail and sickly, liable to topple over in a breeze, and couldn't even lift a five-kilogram dumbbell. The worse news: he had married the neighboring baron's daughter at sixteen, and now they already had two children. What did he have? A copy of The Barefoot Doctor's Manual, a mind from the twenty-first century, and a wife who could fight better than the last. "Boil the water." Those were the first words he said to his fief. Everyone thought he was crazy. The next year, dysentery disappeared. By the third year, more children were surviving. In the fifth year, the granaries were full. By the tenth, the neighboring earl's people were coming over of their own accord to join him. This is the story of a sickly man who couldn't fight, run, or stay up late, and how he took a manual, a box of medicine, and a single sentence from an earl's fief to a kingdom of nearly ten million people. This isn't a power fantasy. There's no golden finger. No punching a dragon into a bloody pulp. But he has time. "First, survive. Then, live well. After that, help others live well, too.", Yang Zongan, the American King, founder of the Kingdom of America, the poorest, weakest, and most resilient king in history.