Emm is used in different environments:
1. In order not to be embarrassed when bored, you can use this word when you are not interested in the chat content.
2. Use this word when you are perfunctory or impatient.
Use this word when you feel sorry for each other but don't know how to comfort them.
When you know this word, you can use it.
5. You can also use this word when you are spoiled, wronged and cute.
The man on WeChat sent this Emm expression because he was not very interested in the current topic. In order not to silence, he replied this expression politely and awkwardly, probably thinking about how to answer but not knowing what to say, so he sent an Emm expression transition. Many times, this popular Emm word is considered as a perfunctory word, but everyone's habits are different. Maybe the other person is just used as a modal particle and has no other special meaning.