"This was not a spur-of-the-moment act by the deceased, for there were six glasses in the set, all placed in a box. If it were you, would you search for a glass in the box instead of using the ones readily available? Clearly, there was an unexpected visitor, and the deceased took out a new glass that had never been used before," Nan Zhan said as he picked up the ashtray on the other side of the coffee table, and immediately a technician retrieved a smoked cigarette butt from it, "The owner of this cigarette was the second person to come into this room."
Jian Si whispered, "Piaopiao also smoked."
"Yes, I know," Nan Zhan nodded. "The deceased usually smoked women's cigarettes, while this strong-smelling cigarette is a favorite among men."
"But how do you know that the person who drank water and the one who smoked are not the same person?"
