The fastest way to send money internationally to someone in Korea is via Western Union. Money wired through Western Union is accessible at any branch of 6 different banks in Korea. The person receiving the money should present proof of identity such as a passport. Another way to get money is to contact your credit card company or arrange for a bank-to-bank transfer, but this may take several days.
The State Department can set up an OCS Trust, but there is a $30 fee to establish the account and this is not as fast as using Western Union or your bank. After the U.S. sender places money into the OCS account, the recipient in Korea can pick the money up from the Embassy’s ACS office during working hours.