Yun Posun, South Korean activist and politician, 2nd President of South Korea (died 1990)

Yun Po-sun was a South Korean politician and activist who served as the second president of South Korea from 1960 to 1962. He was the only president of the short-lived Second Republic of Korea, and served as little more than a figurehead due to its nature as a parliamentary system.

The president of the Republic of Korea, also known as the president of South Korea, is the head of state and head of government of South Korea. The president directs the executive branch of the government and is the commander-in-chief of the Republic of Korea Armed Forces.