The entire sofa is wrapped in premium full-grain leather with delicate uniform grid stitching that creates a three-dimensional cube visual texture, each seat block filled with high-density down-blend foam to deliver soft deep-sitting comfort without permanent sagging. Two interchangeable back cushion designs are provided: soft plain leather square pillows and grid-tufted layered back cushions to meet different aesthetic preferences, paired with detachable rectangular armrest bolsters that can be placed on both sides or removed as needed. Thickened solid hardwood inner frame with metal bottom trim ensures stable bearing capacity and durable service life, low flat base eliminates bulky legs for a sleek floating silhouette, all leather cushion covers are detachable for convenient surface maintenance and stain cleaning. Multiple leather colors and modular length combinations are supported for interior designers, hotel project contractors and furniture wholesale clients.