E-Ticket print receipt

I will fly from Munich to Shanghai and then, 72 hours later, to Seoul.
So no need to apply for a visa.
But my question is: I bought a ticket of China Southern Airlines through Expedia (Shanghai to Seoul), I have the numbers of the reservation and the number of the tickets, is it enough? Can the print of the Expedia itinerary with the confirmed numbers of itinerary and tickets be a valid document to obtain the free 72h visa?

Thanks