Yangban boys were highly educated in Hanja.
Hanja is the Korean word for Chinese characters.
His layname was Seol(설 Hanja: 薛) or Bak 박 Hanja: 朴.
The Goryeo period was marked by a growing use of Hanja.
Lee Min-ho(Hangul: 이민호; Hanja: 李敏鎬,
born June 22, 1987) is a South Korean actor and singer.
Korean: Samsung Jeonja, Hangul: 삼성전자; Hanja: 三星電子 is a South Korean
multinational electronics company headquartered in Suwon, South Korea.
Hanmun(한문) is about the Chinese Classical writing, but Hanja can sometimes be used to generally mean hanmun too.
But until then, everyone mostly read and wrote in Hanja, so most of the older books in Korean literature
are written in Hanja.