Falling in Love in Republican-Era China

Updates irregularly, no paid chapters, seme protagonist, Republican-era setting, slow burn After transmigrating to the Republican era, Jiang Yichen becomes a returned student with the same name, heading home in second class. When Jiang Yichen opens his luggage, he discovers his diploma is fake, and so is his degree certificate. After returning home, he's unable to get a job at a large company, so he can only take a teaching job with a wealthy local family. That was the second time Jiang Yichen met the young master. The young master obediently called him, "Sir." A few years later, the two get together. Jiang Yichen becomes a well-known engineer, and the young master still calls him, "Sir." Only... In front of others, the young man adds two words before "Sir." "My family's." "My family's Sir." [Content warnings] ☆ The setting is entirely fictional, with many original details. The male lead has a huge golden finger, and is idealized. ☆ Every element of the setting serves the plot. ☆ When it gets finished depends on the author's mood. Theme: You are my Sir for a lifetime.