Traveling Through the Courtyard, I Was Targeted by the Country at the Beginning

It's a pity that if you travel to the past without a system or knowledge, it will be difficult to help the people! ! ! For example, if a modern person travels back in time, how many of them can remember technological knowledge or important events? Unless they have knowledge about future development after traveling back in time! Or bring a system! The system rewards scientific and technological knowledge such as "Solar Water Heater" Or Agriculture "Chemical Fertilizer and Potassium Fertilizer Extraction Method and Pesticide Agriculture" to solve food famine [Petrochemical]

Still watchable