I am a qualified English teacher, who is currently completing my 4th and final year. Canadian Connection caters to jobs in Jeollanamdo, which is in the far south of South Korea. Jeollanamdo is known for its friendly people and its beautiful scenery. It is very clean, very safe and it is relatively cheap to live here, as compared to North America.
Your will be responsible for assisting Korean English teachers with the curriculum. It is definitely not necessary to be a 'qualified teacher.' In fact, many of the best ESL teachers are not; they are, however innovative, passionate and creative! You are not responsible for marking or report cards. Your soul responsibility is 'conversational English' and getting the students more comfortable with the language via games, activities, worksheets, role-plays, etc.
I HIGHLY recommend living and working in South Korea and I HIGHLY recommend Canadian Connection! It is a great recruitment company that offers its teachers a lot of support and educational workshops.