The project proposes the adaptive reuse of a historic red-brick building in Seoul’s Marronier Park, transforming it into a creative day center for children focused on nature-based learning. By respecting the site’s architectural heritage, the design maintains the original heavy masonry as a host structure, onto which a series of “parasitic” lightweight timber interventions are grafted. These additions serve as a soft, welcoming interface that breaks down the building’s monumental feel and scales it to a child’s perspective. Through the use of warm wood and translucent fabrics, the project creates a tactile contrast to the rigid brick, forming porous transitional zones that blur the boundaries between the interior classrooms and the surrounding park. These light-filled spaces act as a “living fringe,” inviting the community in and providing a playful, sheltered environment where children can engage in creative activities while remaining in constant visual and physical contact with the natural world.