The Ethos of Yui (儒醫): Filial Care and Vernacular Korean Healing
1. The Filial Imperative: Medicine as Confucian Virtue
In Joseon intellectual circles, ignorance of medicine was considered a moral deficiency. Prominent scholars like Toegye Yi Hwang, Dasan Jeong Yak-yong, and Andong Kim patriarchs kept detailed personal medical notebooks (*Uibang* / 醫方).
If a parent fell ill, the eldest son was expected to personally examine their pulse, check their tongue coating, and verify the proportions of herbs in the decoction cauldron. Healing was viewed as restoring harmony to the cosmic microcosm of the body, mirroring the statecraft required to govern a peaceful realm.
2. Epistolary Remedies in Queen Sunwon's Court Letters
Queen Sunwon's palace letters (*Eopil Eongan*) preserve extraordinary glimpses into private nineteenth-century royal health care.
When epidemics of smallpox or cholera swept through Hanyang, or when royal children suffered from digestive fever, the Queen wrote urgent instructions ordering wild mountain ginseng (*San-sam*), deer antler velvet (*Nok-yong*), and *Gongjin-dan* pills to be dispatched immediately from the royal pharmacy (*Naeuiwon*). These letters demonstrate how herbal knowledge served as an emotional and medical lifeline between the royal palace and the clan's ancestral estates.
UNESCO Inscription: Dongui Bogam as World Heritage
In 2009, UNESCO inscribed Heo Jun's Dongui Bogam on the Memory of the World Register—the first medical book in East Asia to receive this honor. UNESCO commended the text for its pioneering preventive healthcare philosophy (*Yangsaeng*), its systematic public health accessibility, and its revolutionary compilation of native Korean plant nomenclature (*Hyang-myeong*), which enabled even the poorest peasants to find healing medicines in their surrounding hills.