Having seen one or two episodes randomly quite a few years ago, I sat beside a person on the Thalys going to Paris who was watching multiple episodes. I have always been intrigued by this series so when I got home I ended up acquiring all 6 series.
I am now half way through season 2 and I am totally hooked. Great music, interesting characters, love, jealousy, sex, drugs, plastic surgery and an interesting twist in each episode – perfect entertainment.
If you want to get an idea, check out the overview on Wikipedia although there are a significant number of websites on this topic.