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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 by its nature as a parliamentary system. Having entered politics after World War II, Yun served as Secretary to Korea's Chief of Staff in 1947; and was Mayor of Seoul in 1948. He served as Commerce Minister for the newly liberated Korea from 1949 to 1950. Wikipedia