I cannot find any information confirming that he was a mayor, but he was indeed connected to the municipal administration because, according to your document, he was a scribe for the Zvižd county, and Kučevo is part of that county. Therefore, Živojin was born in Kučevo because his father was serving there at the time, which does not necessarily mean that Milan was originally from Kučevo. He was probably serving there. He could be from Petrovac na Mlavi, which is my hometown, so I will try to gather some information about Milan or Živojin through some friends. However, this will take about ten days as I am currently out of the country. I also asked a person who specializes in the military history of this region, and he is not familiar with that name. He told me that it's possible they lived in this part of Serbia but were not originally from here, as government officials from other parts of Yugoslavia were assigned to this area between the two World Wars. Your ancestor might have been one of those officials. I must repeat, that surname is not typical for this part of Serbia. My suggestion is that you or someone close to you take a DNA test. Based on the DNA test, you will see who your relatives are and where they live, which will help you narrow down and better define the area of your ancestor origin.