US > Beijing > Shanghai > Seoul (US Passport holder)

Hi there,

My upcoming trip starts in the US and then has a 2 hr layover in Beijing before arriving in Shanghai on a Friday morning. Then, I have a trip from Shanghai to Seoul on Sunday afternoon (less than 72 hours). Does it matter whether I have a 2 hour layover in Beijing before I reach Shanghai? (Referencing the following rule: "The flights can only stop in one Chinese city, meaning passengers have to enter and exit from the same city, except in Shanghai, Zhejiang, and Jiangsu, where the 144-hour visa-free transit has been implemented. For instance, if a flight lands in Xian via Beijing, passengers are not able to enjoy the policy." ). I only plan to leave the airport once arriving in Shanghai (not Beijing).