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This is a book written by Yun Jong-ui, who had growing concerns about the infiltration of Western powers, particularly in the late 19th century. The work aims to propose strategies for “rejecting the heterodoxy and protecting the righteousness” and is organized into seven volumes and five books. The increased presence of French fleets since 1846 (the 12th year of King Heonjong’s reign), heightened the sense of crisis regarding the infiltration of Western powers. Hence, the ruling class at the time, predominantly Confucian scholars, adopted the direction of “refuting the heterodoxy and protecting the righteous” to prepare for this perceived threat. In Yun Jong-ui’s book, Catholicism is identified as the invasive Western power.