This is one of the must-have application when you travel to Korea.

You can find free verified and high speed wifi hot spots based on your location.
Here verified means that the wifi hot spots are run by government so it's secure.

There is no capacity limitation about using these wifi.
So you can download or upload big size files.
You can share nice pictures with your friends as free of charge.

What you should do is to agree the location permission then the wifi hot spots around you will be shown.
(Your location will be used only for finding free wifis. It will not be sent to the network.)
You can change the coverage area in the setting so that you can plan your journey based on the wifi hot spots.

Enjoy Korean more with free high speed wifis :)