What is "nobi"

Nobi is a term for the historically lowest caste in historic Korean society. It is the Sino-Korean word for a system of servitude in place between the 4th and 19th centuries. Its status diminished greatly during the latter half of the Joseon Dynasty, and it was eventually abolished (along with other aspects of the sinbun class system) with the adoption of the Gabo Reforms (1894–1896). Nobi can refer to both the system itself and to the people in the system.