I’ve written an article on teaching English in South Korea. My friend Mike has posted it to his travel website. You can find it here:
http://www.artofbackpacking.com/teaching-english-in-south-korea/
https://trvlmike.com/tips-to-get-you-started-teaching-english-in-south-korea/
I have been putting together a couple of posts about Korea that I will post later.