- Serial No. 36
Jeong YagYong, who are the SilHak Scholar during 18th to 19th century, wrote the Sadaegore with his pupil Lee Cheong. This work is the guide of diplomacy, which are asked to write from King Jeongjo. Although this book was completed after King Jeongjo's death, it harbors the King's thoughts about diplomacy or the relationship with China. Haebanggo, one chapter of the book, is about marine policy and how to treat the castaways. In this chapter, Jeong YagYong provides various ways to deal with these problems in marine area and sea refugee I will examine the Jeong YagYong's thought about the problems and ways to address these problems. Futhermore, I will inquire Jeong's opinion on the boundary in marine area. He recognized that many border transgressions happened in marine area at that time and considered that as urgent political affairs. Haebanggo consists of two parts. First part of the book is about protect own island from other countries. The rest part is about cases of dealing with castaways and their transgression. I argue that Jeong YagYong intended to make distinct borderlines in marine area and empathized the necessity of protecting Joseon's islands from other countries.