Hou Hsiao-hsien's 1989 historical masterpiece *A City of Sadness* is a landmark in Taiwanese cinema and a timeless classic for Chinese-speaking audiences across the mainland, Taiwan, and Hong Kong. When the 4K restoration of the film was set for global re-release, LI TRUST handled the high-speed cross-border transfer of the restored master. Digital restoration files are typically several times larger than the original — a complete master for a 120-minute 4K restoration can range from 2TB to 5TB. LI TRUST's dedicated transfer lines are optimized for ultra-large files, employing resume-on-failure and chunk-based verification strategies to ensure file integrity even during network fluctuations. The 4K restoration of *A City of Sadness* was successfully delivered to multiple distributors and film archives worldwide, providing the technical backbone for the digital rebirth of this classic.