as far as i know you do not really need to convert your license in mynamar. which company you joining ? expats there get a validation from the local authorities and forget about contacting them via telephone. but you have to sit for some local papers i.e airlaw and then later on will be your visa's and permit renewed yearly and it is quite difficult for expats to get one. i see that you are from korea, why go myanmar ? there are so many opportunities out there. just my 2 cents.