This is a collection of writings by Jeong Mong-ju (penname: Poeun, 1337-1392), a civil official and a scholar in the dying days of the Goryeo Dynasty. Following its original publication in 1439 (the 21st year of the reign of King Sejong of the Joseon Dynasty) by his son, Jeong Jong-seong, it was reissued several times. This copy was published in the late Joseon Period.