I respectfully disagree ulhaq. There are still some ways to make small profits.
If there was a way to successfully capitalise on Korean premiums they would've been erased within a matter of minutes. Korean premiums are several years old. That says everything you need to know. No one leaves free money on the table.
If you can manage it then great. No one else can.
I would suggest doing a google translate post in the Korean forum too. I presume it's crossed many a mind there.