Confirmation on trip details

Hello! A friend told me about the visa exemption and it could save quite a bit of money! I wanted to confirm my tentative itinerary before canceling my visa office appointment.

A: SEOUL --> SHANGHAI (SHA), potentially Korean Air
B: Staying in Shanghai 4 nights
C: SHANGHAI (PVG) --> VIENNA, potentially Austria Air

To confirm: A-B and B-C need to be non-stop/direct flights with no stopovers in just China or in any other country? Could I do C: Shanghai to Dubai (3 hour layover) to Vienna final destination leaving the country for example?
Will we be handed the blue 144-hour entry/departure form on the flight?

Thank you so much!