This paper approaches the Tai Ji Men case through the lens of sustainability studies, emphasizing that long term development depends not only on environmental stewardship but also on justice, trust, and institutional integrity, as highlighted in the UN 2030 Agenda. Rather than treating the case as a religious dispute, the analysis frames it as a governance issue involving freedom of belief and the state's responsibility to uphold conscience rights. Drawing on concepts from environmental engineering—such as system resilience, cumulative contamination, and remediation—the paper proposes an interdisciplinary model for understanding how unresolved administrative injustices can create "institutional contamination" within democratic systems. The persistence of unlawful administrative actions even after court rulings affirming innocence illustrates how such contamination erodes public trust and affects the exercise of belief and conscience. Situated within the Sustainable Development Goals, particularly those concerning peace, justice, and strong institutions, the paper argues that safeguarding belief practices is integral to sustainable governance. By integrating sustainability theory with the study of belief related rights, the paper contributes to broader discussions on the ethical foundations required for resilient and trustworthy institutions.