Su Chen was born with a lack of emotions, but an illness when he was young allowed him to see "emotional words" from the tops of other people's heads. Relying on these words, he learned the social behavior of normal people and matched body language with "emotional words" one by one.
Until Su Chen's "emotional words" suddenly appeared on his head, but he clearly had no mood swings.
Before finding the answer to the question, Su Chen met Wei Jingfeng again, who had no "emotional vocabulary" on his head.
Lack of emotion. Feeling (Su Chen)
Keen emotional perception. Attack (Wei Jingfeng)
Mission: No one is perfect