To legally teach full-time at an institution in South Korea, you must have a degree.
With a Canadian passport, you may enter South Korea for 6 months and work part-time. Some families hire individuals to live in their homes and tutor their children in English part-time. I've heard of sticky situations arising in such cases, such as the tutor baby sitting the child/children more than or beyond the agreed upon hours, or little free time for the tutor.
I don't know how to obtain such a job. An internet search may yield such information or opportunities.