Title: Wae Chosŏn ŭn Chŏng To-jŏn ŭl pŏryŏnnŭnʼga
Subtitle: Chosŏn yŏksa ŭi 56-kaji chinsil hogŭn kŏjit
Subjects: History, Politics and government, Errors, inventions
Places: Korea
Time periods: 1392-1910, Chosŏn dynasty, 1392-1910