Hi there, @LeenSarah. At present, you can add Korean Air and Emirates flight boarding passes by opening up Samsung Wallet > Menu > Boarding passes > Click the + icon on the top right > Choose from the available airlines.
For clarity, as of this writing, there is no facility to add boarding passes from airlines not named above. It's possible (but not guaranteed, of course) that other airlines could be introduced to Samsung Wallet in due course, so please stay tuned.
I hope this helps.
