Need good high school for American sophomore...prefer NOT Seoul

Hello! I'm looking for a good international school for my son who will be joining me in Korea in June. He will entering the 10th grade and has always been in school in the United States.

It would be great if I could find a teaching job at an international school where he could attend at a reduced rate or no cost.

Any advice would be greatly appreciated. We would prefer the Busan or southern area of Korea and not Seoul.