Yu Sang

Yu Sang (; 1643–1723), alternatively Ryu Sang (), courtesy name Yŏjin (汝珍, 여진), was a royal court physician and politician of the Korean Joseon dynasty. He was a smallpox specialist who successfully treated three Joseon kings.

In 1693, due to having cured Sukjong's smallpox, he was granted a political office. Later he became the governor of Seosan, Goyang, Hapcheon and Saknyeong.

His experiences with smallpox are detailed in his book, ''Kogŭm Kyŏnghŏm Hwalyubang'' ().

Supernatural anecdotes featuring him and a divine being circulated due to his fame. Provided by Wikipedia