Globally Blind, I Regain My Sight

In a global "Great Blind Spot" event, I lost my sight along with all the ordinary people on the planet. Two years later, I suddenly regained my sight. As I looked around, I noticed that every wall, floor, and every surface in sight had been painted with the same words: "Don't tell them you can see." "Who wrote these words?" This is the question in my mind after seeing these words. I carefully looked around again and breathed a sigh of relief after confirming that there were no monitoring devices. Three years ago, a plague suddenly broke out and spread almost all over the world. At first, people who contracted the plague only had abdominal pain, which eventually evolved into vomiting and diarrhea. In more serious cases, they could even be unable to breathe and die. But soon, the country found a cure. But no one could have imagined that this was just the beginning of the disaster...