Siheyuan: I Was Defeated at the Beginning and Sold the Aircraft Carrier Backhand.

Lin Weiguo, a shady engineer in the 21st century, has traveled through the "doorstep" of the courtyard house in the 1960s. Yaozi, who was set up by Qin Huairu at the beginning, activated the "Revenge Engineer System". While he was pretending to be a pig, eating tigers, and training wives in the courtyard, he was secretly accumulating black technology. In the end, in the desperate situation of being framed as a spy, he took a gamble on the "turnover system" and turned it into a secret national weapon. He also turned the whole world upside down by "selling aircraft carriers to African veterans".