A realistic depiction of what was happening in Russia in the 80s and 90s. If you know people who lived there during that time, they will basically tell you the same thing. Good actors must also be familiar with the street life to better understand the series. Characters of interest essentially show how everyone looks out for their own interests within every part of society and how everyone reveals their true selves in difficult situations they face. The same music repeats at various points throughout the episodes. At first, it seems tedious, but watching the series as a whole, it feels fitting. I could say it's akin to the lives of the heroes, where every day repeats like a cycle that keeps narrowing until each hero's catharsis arrives.