The purpose of this paper is to compare the changing pattern of the Yet-iyagi which are included in 『Collection of Folk Tales(醒睡稗說)』 , 『Folk Tales of Chosun(朝鮮の物語集附俚諺)』(1910), 『Collection of Chosun Folk Tales(朝鮮童話集)』(1924), 『The Great Collection of Folk Tales(朝鮮大童話集)』(1926), and also which are commonly included in the South and North textbooks from the 1945 Liberation until now. But, because the textbooks of North Korea have not dealt with Folk Tales, the author selected 「A Tiger Which Does Not Thank For Favor」 which might be appropriate for this paper. This Yet-iyagi is also better known as 「The Judgment of a Rabbit」. The results are as follows:In North Korea, when we divide the animal story into 'Event Part' and 'Aphorism Part', 「The Judgment of a Rabbit」 omitted the 'Aphorism Part', and put the great emphasis on the punishment for the betrayal. This seems to be the dichotomous thinking based on the core policies of North Korea such as citizenship, cooperation-unionship,In South Korea, Yet-iyagi put the great stress on the "Thanks for the Favor', and explained in detail the changing pattern of the "Aphorism Part'. This differences come from the differences of the basic attitudes between the South Korea and North Korea. Namely, in case of South Korea, the main purposes of the ‘Yet-iyagi’ have focused on the development of creativity and fantasy, while in case of North Korea, they have tried to strengthen the Ideology of Communism even in the 「The Judgment of a Rabbit」. Thus, in 「The Judgment of a Rabbit」 of North Korea, serious problems have proposed, because the original meanings of the yet-iyagi have been modified according to the changing patterns of ideology of the communism. The common meaning of the comparison of the changing pattern of the Yet-iyagi of South and North Korea is to promote the internal growth of children and adolescents and to heighten the educational contribution through story pattern of the animal. In addition, the meaning of this paper lies in the finding of the common emotion of the Korean in all, in spite of the ideological differences between South and North Korea.