Lee, Ju-hong(1906-1987) is one of the authorities in Korean modern literature, A goal of this article is to investigate and report activities in juvenile literature, which occurred mainly relating to Shinsonyun from mid of 1920 to mid of 1930. First, Lee made his debut to Korean literary circles with publication of Immorality of a young snake on the May issue of Shinsonyun in 1928, Second, in Shinsonyun juvenile stories usually consist of fables, which try to tell about class contradiction, and novels include miserable experiences of family, which happen to boy and girl protagonists. His descriptions have a characteristic to make a complete view of class contradiction in the colonial society of Korea. Third, childrens verses show two aspects, the reality of excluded children from the systematized education of Japanese imperialism and of labor exploitation in the colony. This helps to make a complete view of the reality of national contradiction simply. Fourth, juvenile dramas are conspicuous at forms, such as a one-act play, amateur play, and chorus play. Instead, class or national contradiction is declined in them, Fifth, early juvenile literature of Lee, Ju-hong is very meaningful because it shows many ways of early enlightening direction on which the proletarian juvenile literature in Korean tried to move.