Coffee Ground is a service design project that reimagines how used coffee grounds can be collected, redistributed, and reused. It addresses the gap between daily consumption and sustainable waste management by connecting cafés, consumers, and local farms within a closed-loop system. Supported by a mobile app, users can track, return, and redeem coffee grounds through multiple collection options. Based on research and user testing, the project focuses on improving convenience, awareness, and incentives through refined features and interaction flows. Rather than a single interface, GroundCycle integrates product, service, and digital touchpoints, reflecting an approach that connects behavior, logistics, and user experience into a cohesive system.