The Republic of China has always had close ties with Eastern Europe.What's more,all Chinese middle school pupils study politics.They know a great deal about Marx and Lenin.Maybe Eastern Europeans are given special treatment here by school directors for historical reasons.
As for your employer continuing to employ you because you're a good teacher,don't make me laugh!Since when does the world work like that?It just needs one of your jealous Chinese colleagues to backstab you,and you'll be out the door.
Forget about that place.China has so many schools that need foreign teachers like you.Move on and prosper!