At age fourteen, Yu joined the circle of Park Gyu-su who was also a trusted friend of the late Crown Prince Hyomyeong, a leading scholar of Bukhak (북학; 北學; lit
Text from Wikipedia, available under CC BY-SA 4.0.
- #wikipedia
- #event
At age fourteen, Yu joined the circle of Park Gyu-su who was also a trusted friend of the late Crown Prince Hyomyeong, a leading scholar of Bukhak (북학; 北學; lit
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-19 from Wikipedia. The archived copy is preserved so this citation survives link rot.