Native English speaking ability. You must be a native English speaker. Strong regional accents are discouraged. The upper Midwest is considered accent neutral in Korea.
Younger applicants are preferred.
If you are over age 40 it is more difficult to obtain employment. The more experience you have the higher your base salary is. Round trip - airfare is paid in advance. Shared furnished housing near your school will be provided. If you are a couple and both teach, an apartment will be provided only for you couple.