Many people think they know their rights here, eg whether you can teach privately, whether your boss can tax you, make weird deductions , punish, penalize, fire you, etc, etc.
The site below has the laws, try to get aquainted with laws.
Try to know your rights and STATUS here a teachers.
Try to find out your job title, pay, tax,Codes of conduct, ect,etc- it's important to know if the Korean version of your contract is the same.
Try to find out if you work for a Private School or Public?
The acts are different and your rights too.
This may affect you pensions, taxes, all sorts of things you could be losing later, missing out on.
Learn early- lose less later.