Background: Social welfare services face challenges, such as fragmentation and workforce shortages, which have led to a growing trend toward the development of symbiotic services. Objectives: (1) To analyze strategies for integrating people with disabilities into long-term care sites, (2) To examine the concept of “non-rejection” in relation to participation, and (3) To explore the roles of people with disabilities within symbiotic services. Methodology: Framed by the social inclusion theory, this study employed observational research and case study methods. Findings: (1) A spiral process of “doubt–rejection–reflection–acceptance–inclusion”, (2) Key strategies that facilitate the transition from exclusion to inclusion, and (3) Cultivating professional capacity for social inclusion through everyday interactions. Recommendations: (1) Define community inclusion indicators and supervisory mechanisms based on non-exclusion and full participation, (2) Adopt service designs grounded in identity reversal, (3) Shift from single-discipline to interdisciplinary practice, and (4) Implement human rights-based diversified service models.