4·19 혁명
The spirit of April Nineteenth and March 1st Movement is stipulated in the preamble of the Constitution of South Korea. But it took a long time to be established. The contents of the April Revolution were removed on the fifth amendment, and these were included in the preamble on the sixth amendment, identified with May 16 coup. After the ninth amendment, the spirit of the April Revolution was excepted from the preamble, and it was included for the ‘Resistance ideology for protection of democratic constitution’ on the 10th amendment.