What type of person would have had this mirror? Would it have been a wealthy person or an average person?
Highly decorated mirrors like this would have been owned by wealthy people in Korean history. They were a common luxury item.
Would they only have one or would they have multiple?
In terms of how many mirrors one person would own, it would have depended on how wealthy they were and thus how many they could afford.
What can you tell me about Ning Qi?
The Story of Ning Qi comes from China and takes place during the "Spring and Autumn Period," from the 700s to the 400s BCE. The story tells of Ning Qi moving from the kingdom of Wei to the kingdom of Qi because he wanted to work for a man named Lord Huan.
Ning Qi waited outside the Lord's castle until he came out. Ning Qi then sang a song using the horn of a living ox as an instrument. Lord Huan was so impressed that he hired Ning Qi as an advisor.
What kind of tree is on the mirror?
I don't have any notes on what tree this is meant to represent, but it does look to me like a cassia tree, a type of flowering tree that commonly appears in Korean art.
What is the knob in the middle with holes on either side, would that be used for hanging the mirror?
A rope or handle would be threaded through the knob with holes.
Is there any significance to the symbol at the bottom of the mirror?
I'm not sure what that symbol is. My best guess is that it is a Chinese character. It may even be a Chinese character backwards which sometimes happened on mold-made works made by craftsmen who did not read Chinese themselves.