Korea really sucks for international schools. Some are great, but I've heard horror stories even for the proper ones without naming any names. For example there are reports of teachers not getting paid on time or not getting paid for months on end...and this isn't 2.2 hagwon pay either, we're talking salaries in excess of 5k USD per month, so imagine someone not getting their salary for 3-4 months!
The Postgraduate Certificate in Education (PGCE/PGCertEd) is a one- or two-year higher education course in England, Wales and Northern Ireland which provides training in order to allow graduates to become teachers within maintained schools.