There are lots of free WiFi access-points in Korea.
Local government Seoul and central government, both provide free WiFi service.
These pages provide the updated free WiFi zone infomation.
When you find free WiFi SSID, do configure the SSID setting of your device for a connection to 'Public Wifi@Seoul' or 'Public Wifi Free'.
Also if you want to rent a hot spot device we can help you while your statying in Korea.
ADDRESSSeoul, Korea, Earth