Hello, I am working as a business development manager at a Korean IT company in Korea.
I do A LOT of business email and phone calls to various business contacts everyday in Korean. As a business development manager, my job is to convince business partners or potential business partners to get the result my company wants. I believe this also is exactly what you want.
I also used to work with Korean educational institutions when I was developing a educational software. So, contact me to talk specifics. I can get the job done.