In Changdeokgung palace, tourists can experience how royal physicians worked long before western modern medicine arrived in the Korean peninsula.
Later in 1443 during Sejong's era, the title name of Naeŭiwŏn was announced which implies that before 1443, an independent organ for medical issues did not exist.
[1] After three decades passed, Sejo initiated government offices, while the transformation of personnel occurred depending on contemporary situation.
Throughout Joseon, Naeŭiwŏn was the heart of skillful medical affair, affecting tremendous effects of Korean medicine.
Additionally, as royal cuisine of Joseon was quite different from normal dining at that time, Eoui also took charge of serving appropriate diet depending on the symptom and preserving materia medica.