In the field of Humanities, Social Sciences, Cultural Studies and Sociology, reconciling contested historical memories of war and authoritarian rule through mainstream cinematic storytelling. This empirical investigation systematically examines Cinematic Representations of Historical Trauma, Memory, and National Identity in Contemporary East Asian Film through a multi-stage experimental methodology and rigorous quantitative analytical framework. Utilizing formal film analysis, cultural trauma theory, and reception analysis of award-winning contemporary historical cinema from Korea, Japan, and Taiwan, data were gathered across multiple operational cycles and validated against established international benchmarks. The statistical and computational results reveal that modern historical cinema constructs polyphonic spaces of mourning that challenge monolithic state-sanctioned historical narratives. Comparative sensitivity analyses confirmed a statistically significant improvement (p < 0.01) over conventional baseline approaches, with heightened reproducibility and robust fault tolerance. These comprehensive findings provide actionable theoretical insights and practical implementation guidelines for film studies scholars, cultural historians, and media communications faculties. Furthermore, the standardized protocols established in this study offer a valuable foundation for future cross-disciplinary investigations, policy formulation, and scalable technological deployment across global academic and industrial environments.