Courtyard House: A System Connecting Two Worlds, Resources for the Nation

Zhou Feng, a modern man, transmigrated to a courtyard house world and gained access to a double passageway.
Stimulating the birds will upgrade the double-door system.
So he worked as a troublemaker in the yard while also being a middleman in both worlds!
After his identity was discovered in the country in the 1960s, the whole world changed.
"What kind of machine is this? How can it produce cold water?"
"My goodness, you can just throw the clothes in and they'll wash themselves?"
"How come he still has hot water and a toilet at home!"
"No, why are the street officials and the police station pretending not to see it?!"
...
While the beasts were being tortured and crying out incessantly, the entire Dragon Kingdom began to undergo earth-shattering changes!