I am James
I would like to share useful information on internet connection.
I found it extremely irritating, since I was not able to get any sort of internet contract
and prepaid sim was just too expensive.
Being foreign expats, it is difficult get internet,
especially when your duration of stay in Korea is short.
There is a comapany that leases portable WiFi device at only $30 a month
I persnonally use one from the comapany and am very satisfied.
You can just order online and have it delived to your house.
FYI, they have wonderful staffs, you can get a lot of help from those staffs.
I hope it helps!