Walkain, inspired by the idea of "Walk Again," redefines the role of a conventional walker by transforming it from a passive mobility aid into an active safety companion. Designed for older adults and individuals with mobility challenges, Walkain functions as a digital guardian that actively monitors the user and the surrounding environment. It detects hazards such as stairs, curbs, potholes, and edges using ToF sensors, then provides timely alerts and braking assistance. Rather than simply reacting to danger, it helps anticipate potential risks and supports safer mobility before hazardous situations escalate. By combining intelligent hazard awareness, proactive safety intervention, and digital health support, Walkain empowers users to walk with greater confidence, independence, and peace of mind.