Over the last century, Korea’s housing culture has undergone many significant changes. The organization of interior housing space has also dramatically changed, with each space developing a different physical form and with the connections between each space having also been altered. Accordingly, terms given to such corresponding areas have had different meanings. This study aims to explore daecheong, one of the most important living areas in Korean housing, which, with modernization, has gradually transformed into what might be termed geosil(living room). This study will examine daecheong by classifying its history of change into a series of time periods. By analyzing the fundamental changes of Korean residential space through the accommodation of modern-day needs, this article will make the following main arguments: first, a common space has been established for the whole family instead of separate areas based on gender; second, the physical distinctions between the main space and individual rooms have been blurred; third, living space has been reorganized in terms of function and specialization; and fourth, interspace relations have become independent. The final research findings will show that Korean residential culture has partly maintained its unique cultural features while simultaneously going through the collisions and conflicts in the process of embracing housing culture of modern-day lifestyles.