Slave Status DBQ resource

I have not heard of the so-called "low born" or the "commoner" status people of Korea referred to as "slaves" until very recently. It bothered me at first but when I think about it, it is what it is. This class of people did not have any means to move up the social stratus. They are in fact bound by inherited status to work for the lord of the household--the aristocratic status.  When studying slavery in America, this would serve as a good source to compare and constrast the enslaved people and their status in society.