He couldn't distinguish emotions, but he could clearly see other people's movements - the curvature of the corners of their mouths, the number of times they bent their fingers on the edge of the table, and the number of times they chewed.
Looking at people who are okay, their actions say for them - I am not okay.
What's wrong with them? Did they get better afterwards?
Xu Che didn't know. All he saw was a change in their movements.
Purpose: Let people see others in another way.