Lee, I, or Yi is the second-most-common surname in Korea, behind Kim. As of the South Korean census of 2015, there were 7,306,828 people by this name in South Korea or 14.7% of the population.
A memorial for the founder of the Gyeongju Yi clan
The Jeonju Yi family performs rites (jongmyo jerye) to honor their ancestors in an annual ceremony which has been declared an Intangible Cultural Heritage by the Korean government.
Yi I was a Korean philosopher, writer, and Confucian scholar of the Joseon period. Yi is often referred to by his art name Yulgok. He was also a politician and was the academical successor of Cho Kwan