Grandpa's Cool House is a project with the theme of "Finding the identity of a baby boomer generation" and "Taking the modernization process of Korean native architecture". We organized spaces in a way that adds modern functionality and aesthetics while maintaining the layout and meaning of traditional architecture that conforms to nature. Traditional architecture; toenmaru (Korean-style terrace); and cheoma (Korean-style eaves); were made into a modern and natural space by using corrugated sheet made of steel, and the bamboo that grows naturally in Gimhae.