日本と韓国の議論の広場

…あったそうだけど？賤民階級も豊富にあったしねぇ。

Nobi:

Korean word for a system of servitude which was in place from about
the 4th century. Its status diminished greatly during the latter
half of the Joseon Dynasty and was eventually abolished in 1894.
Nobi can refer to either the system itself, or the people in the
system.

Nobi and its proper translation into English have been the subject
of heavy debate among historians, as non-Korean historians
overwhelmingly favor translating it as "slave" and "slavery", while
many Koreans argue that nobi was not a slave system, but a servant
class system that does not meet the criteria for slavery. Many
arguments of this nature, however, are rejected by many non-Korean
historians and scholars, and are seen by some as attempts to
sanitize an embarrassing and ignoble aspect of Korean history.

http://en.wikipedia.org/wiki/Nobi