C193 Webster's Conjectures

I felt a little puzzled now, thinking, I just turned around, how come the coffee dregs in this cup are gone?

I picked up the coffee cup from the coffee table and checked it carefully. I found that this cup was the same coffee cup that Yuan Mengyao had just drunk, and on the rim of the coffee cup, I could see a mark that had been stuck to my lips!

I held the cup and wanted to ask the others