Paju Book City was conceived as an integrated ecosystem for the publishing industry, bringing together planning, production, marketing, and sales within one urban framework. Built on the former floodplains of the Han River, its master plan adopted an “Urban Wetland” concept, weaving green corridors and visual axes through the city to link buildings and open spaces while cultivating ecological awareness. Located in the city’s ‘Bookshelf’ sector, where publishing houses line the street like books on a shelf, the project originally included two buildings: the Translation Residency Center and the head office for Open Books Publishing. Ultimately, only the latter was realized, becoming Fissure House. The design concept draws from the act of translation: two parallel lines that approach but never meet. The unbuilt Translation Center embodied this idea through sloped ramps and a folded translucent glass spine, creating shifting experiences of space and light. By contrast, Fissure House is organized around a continuous concrete wall that defines its perimeter. Along this edge, a glass ramp channels daylight deep into the interior, while circulation unfolds around folded planes. The result is a layered architectural experience of movement, light, and enclosure—an architectural expression of Open Books’ role in bridging languages and cultures.