As you can see, the travel Add-on for Zone Asia/Oceania covers several countries.
So the same travel add-on will give you mobile data in both Korea and Hong Kong.
Remember to enable roaming on your phone and you may need to manually select FIZZ-EXT carrier in some countries if auto network isn't working.
To send SMS, it is pay-as-you-go rate of 10 cents per outgoing text. You need to have funds in your wallet. With Fizz, it is always free to receive SMS texts.
If your question has been answered, please close your post by clicking on the button "Make best answer".
In order to help the Fizz community evolve with your question, do not forget to identify the best answer given to you by members of this discussion group using the Make Best Answer button.