The Chiljeon-dong single-family house was designed for a couple, their child, and four cats. Despite the constraints of a limited site, the house reflects the family’s lifestyle and values through a central courtyard and a series of inward-facing living spaces organized around it. The house is composed of four primary spatial zones. The first is the courtyard. Positioned at the heart of the house, it provides a safe and enclosed outdoor space where the child and cats can enjoy nature. This courtyard visually expands the compact site while maintaining a sense of openness under the watchful eyes of the family. It also acts as a spatial connector, linking different parts of the home without compromising their individual privacy. The second zone is the shared family and guest area. Entering through the main entrance, one encounters a living space that accommodates both everyday family life and occasional guests. It also includes a music area for the couple, who enjoy playing the piano. The third zone comprises the service and secondary entry area. Designed for the father, a physician, this sequence of spaces includes a shower room, dressing room, and laundry room—creating a hygienic buffer between the outside and the family’s living quarters, minimizing the risk of contamination upon returning home from work. The fourth zone, located on the third floor, includes guest accommodations, a prayer and music room, a quiet reading area overlooking the courtyard, and the family’s private bedrooms. These spaces are carefully designed to ensure privacy from the outside while still offering views of the courtyard and the surrounding mountain landscape beyond the roofline. Connecting the first and second floors is a stairwell that also serves as a vertical playground for the cats. Resting areas are provided above and below the stairs, and a dedicated “cat staircase” supports their vertical movement throughout the home.