Some literary works of art give us aesthetic pleasure in the course of representing the actual world. However, the other kind of literary works of art give us the same pleasure by freeing us from the actual world. So we can assume there are two kind of aesthetics in literary works of art. We name the first as the aesthetics of mimesis, the latter as that of fantasy. In recent days the first has been specifically dealt as the major aesthetics of narratives, but the latter has been considered as relatively less important than the first. Of course the narratives have two kind of element, one the mimetic elements the other the fantastic, or at least the imaginative elements. The elements of fantastic, nay the imaginative are the object of this article. Because during those two last decades, many of scholars are major in the first, and the result, the importance of the first is overestimated, contrarily the importance of the latter is underestimated. In some articles I have searched for the value of the aesthetics of the fantasy, and in this article I would like to investigate the structure of fantasy in the Korean classic narratives. Some western scholars, like Scholes, say that the mimetic theory of narratives is characteristic in the western tradition especially in the modern time. I considered the typical fantasy in Korean classic narratives, that is the name of 「Yu Chung Yol」<유충열전>. But the result of this research is not only that of the specific literary work, but that of the fantastic narrative general. I have used three useful concepts to investigate the fiction. First, the concept of Fact that means what happened in actual world or imaginary world. Second, the concept of Text that narrates the Fact. And last, the concept of Literary World that is formed by the Text. The relationship among these three concepts are schemed as the followings. ◁그림 삽입▷(원문을 참조하세요) The conclusions are those. 1. One fact can be textualized in various texts. 2. But if the text is not same, then the fact that is textualized is not the same. 3. Fact, Text, and the Narrative World are different concepts. 4. The fact that is textualized is valued whether it is perfectly represented the fact or not. The representation of the Fact is the base of the aesthetics of realism. 5. We can conclude one is fiction or not by considering whether the Fact that is textualized is actual or not. And I can conclude that the fictionality is bound to the Fact not of the textualized fact. 6. Fantastic aesthetics is investigated by two ways, textualization and plot. When some facts can not be happened in the actual world, but can be happened in the possible world, and the every motifs are ordered by the artificial law of cause and effect[that the plotical law of cause and effect], then the fantastic aesthetics is formed. 7. In Korean Classic Narratives, the alternation of the fantastic and the real cause the sense of contentment and agony. So the readers might have chosen the Korean Classic Narratives to ease the pain that had been caused by the actual world.