After hearing my conjectures, Xiaotao’s eyes widened as she exclaimed, “But what would drive a person to such an extent! How intense was the hatred that the murderer had for the victim?”

“No,” I shook my head. “I don’t think this had anything to do with hatred at all.”

“What do you mean?”

“Look at the victim’s face.”

Xiaotao and several other police officers immediately went over to examine the victim’s face. They all gasped in horror.

“It looks like… she’s laughing!” Xiaotao exclaimed.

“Maybe it isn’t laughter,” commented a policeman. “Maybe it’s an expression she makes under extreme pain.”

“No, she definitely was laughing,” I corrected. “When a person smiles or laughs, we contract more than twenty facial muscles. There is no doubt that the expression on her face is laughter.”

The atmosphere in the morgue became tense after I spoke.

“But… why would the victim laugh?” asked the policeman.

“The answer is very simple,” I replied. “Because...