This standard residential sofa features a versatile modular U-shaped design with 4 separate pieces and a removable ottoman, allowing for endless configurations to perfectly match room size and style preferences while the ottoman easily serves as additional seating or a convenient footrest, transforming living spaces with flexible functionality. Based on scientific ergonomics principles, the body fits perfectly against the backrest when seated, allowing legs to stretch out naturally without any feeling of constraint, and the interior is filled with high-resilience, high-density foam that perfectly balances softness and support— the seating feels soft yet does not sag, and the sofa quickly returns to its original shape when standing up, far exceeding ordinary models. Upholstered in premium corded polyester fabric, the sofa surface is soft, breathable, and skin-friendly, bringing serene warmth and soft comfort while its ribbed texture adds depth and modern style, making it a cozy focal point in any living room or lounge space. It uses innovative frameless couch box packaging that is compact and portable, making it easy to transport even through narrow hallways and elevators— simply open the packaging, unfold the sofa, and wait for it to bounce back briefly before use.