Its good. It is about a guy who has a knack for inventing and building who is reincarnated as the Joseon dynasty prince and helps set korea up for a better future with his knowledge of technology (semi-modern weapons, ships, astrological devices, etc.). MC is smart and its entertaining. Its worth a shot. At the beginning, the MC focuses less on technology development and more on fixing the political mess of the emperor. Things such as trying to make korea stop being a tributary to the Qing Empire (China), centralizing the government, and fixing the fraud of the regional government officials that pocket the people'stax money.