Based in Seoul, architect Byoungsoo Cho is known for his application of South Korea’s technological innovation in architecture. His experimentations include the use of negative space and combining contrasting materials. From the 1980s until the present, his work reflects the perspective of an architect who combines the ancient traditions of Korean architecture with Western inspiration. Through Cho’s writings and interviews with him, this monograph gives the architect an opportunity to expand his views on Korean materiality and spatial concepts, and especially on the concept of ‘mahk’, the Korean word for imperfection. It also includes an essay by critic Kenneth Frampton.