Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Myrtle Beach to Seoul as you normally would.
MYR stands for Myrtle Beach Intl Airport, while ICN stands for Incheon Intl Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Seoul Gimpo Intl Airport (GMP) are other airports near this flight route and their unique identifiers/IATA codes.