"The Cradle-land of Modern Art" is an important article published on May, 14th~23th, 1934 in Me-il-Shin-Bo, a famous daily news paper in Japanese Colonialists ruled Korean Peninsula. The name of writter`s that article is Kim-Hae-Gyeong, 金海慶with Chinese character. Kim-Hae-Gyeong was entirely unknown person in Korean Modern History. Yi-Sang is a very famous poet, novelist, painter & architect in Korean modern history. Yi-Sang is pen-name. His real name is Kim-Hae-Gyeong. But the Chinese characters of his real name is not 金海慶but 金海卿. This essay want to prove this article`s writer is Yi-Sang. "The Cradle-land of Modern Art" deals with how to be changed & improved from middle age`s art till modern art in Western culture. This article focused & emphasized role of Cezanne to develop the modernization of fine art. The writter said real modern art had begun cubism. In the future, cubism, vorticism. fauvism, surrealism, dadaism etc are going to be popular. Those are based on expressionism. In the same time, most Korean painter`s article about western art history was focused on impressionism. But the art book published Bauhouse emphasized role of Cezanne & expressionism. Yi-Sang was under the influence of Bauhouse as an architect & painter. In addition, the writing style of this article are very similar to Yi-Sang`s. Yi-Sang has liked using different pen-name, every different genre essay or literature. The conclusion of this essay is quite within the realms of possibility that the writter of "The Cradle-land of Modern Art" is Yi-Sang.