In succession to the poets Song Sun and Hwang Jin-I, Yi Hwang(1501-1570) composed Do-San-Sip-I-Gok(The Twelve Songs of Do-Mountain). This fact has a considerable meaning in the progress of Korean literary history. As the Buddhistic poet Gyun Yeo(923-973) had composed Bo-Hyeon-Sip-Weon-Ga in the form of the national poetry Hyang-Ga at his time, the Confucianistic poet Yi Hwang composed his poem Do-San-Sip-I-Gok in the form of Si-Jo. And as the Gyun Yeo had written his poem on the basis of Buddhism, so the Confucian Yi Hwang, according to the Confucianism, wrote his poem. First of all Yi Hwang`s concerns for Korean language was a notable one. For this was an expression of independent spirit which was promoted after the creation of Korean alphabet.
And it is noteworthy that Yi Hwang introduced a new method of philosophic poetry which had been widely favored in the Sung dynasty. That is, even the meanings of ordenary things and usual objects selected in the poems are transfigured as the Confucianistics. Therefore the poetic possility of Korean figurative language was, in result, enlarged and deepend. Though Yi Hwang`s poetics might be connected with the Chinese philosophical one, the poem Do-San- Sip-I-Gok is not a plagiary. The poem Do-San-Sip-I-Gok composed in Korean native language is the fine example of success in utilizing a new poetic method.