HUANGYAI is developed on the LINE platform to address challenges in collaborative elderly and patient care, where multiple caregivers often face issues such as miscommunication, missed appointments, and scattered information. The system provides a centralized solution for managing schedules, medication, and essential care data, allowing all members to access and update information in real time with role-based notifications to reduce errors. It also supports a backoffice system for administrators to manage data, control access permissions, and monitor system usage, ensuring security and operational efficiency.