Chapter 204: Medicine Doctor An glanced at the servant. The servant shrank his neck and shut his mouth. Yan Yu said openly, “It’s just that I vaguely remember seeing something like this before, that’s why I thought of this idea. My uncle, Uncle Liang, and the city guards were all wearing masks. I don’t know if it was because of that they didn’t catch it, so we’re planning to make more to send over. It’s not good to keep using the same one over and over.” “Once replaced, they must be…