I wish I could pinpoint exactly what makes this show so brilliant. When I started watching it, I thought it would be good to have on in the background while I cleaned my room. But soon I was just sitting down watching it because it is so fascinating. It gives a look into the minds of criminals in an easily digestible while not downgrading the severity and insanity of these people. And each episode covers a different crime that is both disturbing and captivating. This show will make you paranoid, but you'll also learn a lot about crime in America which is a cool thing to get out of a show. I also loved this show so much, when I heard they were doing a Korean version I instantly checked it out as soon as it was released. There's just something about the stories that are so riveting, you can't help but become obsessed.