On December 20, 2025, Hainan Island officially commenced independent customs operations, marking a historic shift in China’s economic landscape. The local China headhunting firm SunTzu Recruit analyzes the "Seal-off," detailing the zero-tariff policies, the 15% tax caps, and the massive influx of industries and high-net-worth talent transforming Haikou and Sanya into global business hubs.