"The human face has 43 muscles and 10,000 expressions. Micro-expressions only last one-fifth of a second..."
"What I want to ask is why do you want to learn this? Isn't it easy to judge whether others are happy or sad?"
"Because I can't feel it."
"Can I ask you a question?"
"Okay."
"Why are your words and emotions always at odds with each other?"
"Su Shi, I have to leave."
"Okay."