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After the student revolution, power was briefly held by an interim administration under the Foreign Minister Heo Jeong. A new parliamentary election was held on July 29, 1960. The Democratic Party, which had been in the opposition during the First Republic, easily gained power and the Second Republic was established. The revised constitution dictated the Second Republic to take the form of a parliamentary cabinet system where the President took only a nominal role. This was the first and the only instance South Korea turned to a parliamentary cabinet system instead of a presidential system. The assembly elected Yun Bo-seon as President and Chang Myon as the Prime Minister and head of government in August, 1960.