What we have tried to do in this thesis is to portrait Korean early-modern era`s custom depicted in Mujeong, for we thought that the essence of social system is embodied in daily life and custom. So we used the word `fashion` to mean the modern custom and social formation broadly, explaining the significance of many literary examples of modern custom related with glass, high collar, free-love, train, eugenics. And through this approach, we found out that glass is a key point of modernity. Separating everything from everything, it symbolizes the structure of modern human subject and modern age. Hence glass is the most important ground of Mujeong`s fashion. It defines the modernity of human actions. For example, the modern costume described in Mujeong is related to poor Hyoungshik`s excluded social position and desire to marry Sunhyoung and study abroad at her rich father`s expense. It also means free-love. But free-love is not only a new social relationship which liberates human individuals, but also a part of national program to regulate people for the purpose of nation`s reproduction and regeneration. So free-love ideology is a sort of eugenics. This accords with glass, the symbol of social difference and capitalistic exclusion. In this way Mujeong`s interest in modern fashion expresses the desire to survive in the world of the struggle for existence. It is the real fashion and the literary significance of Mujeong.