Yi Kwangsu (Korean: 이광수; Hanja: 李光洙; February 1, 1892 – October 25, 1950) was a Korean writer, Korean independence activist, and later collaborator with Imperial Japan. Yi is best known for his novel Mujŏng (The Heartless), which is often described as the first modern Korean novel. His art names were Ch'unwŏn and Koju. He adopted a Japanese name, Kayama Mitsurō (香山光郞).
Source: “Yi Kwangsu”, English Wikipedia (CC BY-SA 4.0), excerpt
