I should note that I graduate from my Master's program in May. I'm assuming that my letter of intent to graduate should be fine until I have my copy of my degree and master's transcripts?

I should note that I graduate from my Master's program in May. I'm assuming that my letter of intent to graduate should be fine until I have my copy of my degree and master's transcripts?

Yes, that will substitute your MA degree and transcripts until you receive those. But, you must make sure to obtain them and have your MA diploma apostilled before coming to Korea. (if your MA is education related, if not, you don't need to have your diploma apostilled)