Thanks Lee,for answering my question, 144 hour twov

We travel from Dubai to Shanghai for a 2 night pre cruise,before boarding the ship,then go to Seoul in S Korea,then into Bejing for 3 nights on board the ship,then back to Jeju island in South Korea,then on to Japan.
Do we still have to apply for the 144 hour transit pass tho we don't need a visa,if so where do we get the 144 hour pass.

Thank you.