What does it mean when the green code changes color and gets angry quickly?

It means that the consequences of the health code changing color from green code are very serious. "The green code changes color quickly" is a slogan during the epidemic prevention period. By "getting angry quickly" it indicates the seriousness of the matter, indicating that the consequences of the health code changing color from green are serious, because only those with green codes are safe. The health code is based on actual real data and is a personal QR code generated by citizens or people returning to work through their own online declaration and after back-end review. This QR code serves as an electronic voucher for personal entry and exit in the local area, enabling one-time declaration and universal use throughout the city.