If you leave Nanning normally, as long as you don't go to areas with serious epidemics and don't contact positive patients, the health code will not change.
Health code is a personal two-dimensional code based on actual real data, which is generated by citizens or people who have returned to work on their own online declaration and background audit. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city.