I don't think he gives interviews. Even if you ask he won't respond . I'm saying these because many have tried. No english reader ever got response (I once got "thank you" but that doesn't counts). Heck even korean readers don't get response. Sorry.
Of course you might try your luck and email him (the email address is given at the end of every chapter).
Authors are somewhat active on the dan cafe though. http://cafe.naver.com/noblessfan
the dan café would be nice if it has a translation of English lol so sad