I don't know if this is the best place to put it, but seeing that Osay has approved this method (http://mabination.com/threads/85809-...=1#post1286404) and doesn't consider it modding it's fully within the rules.
Simply relocate your NA HShield folder to a backup spot or just rename it. Then where you have Mabinogi installed, copy this HShield folder from the KR client:
It seems that KR fixed their hackshield at some point.
One thing I do want to note is that some anti virus programs hate KR's Hackshield even more than NA's Hackshield so you may need to temp disable it when you launch as is the case with the one I have. After it launches though you can turn it back on.