I consider myself a true fan of the series, not of one in particular, but the series itself, I like to do marathons and watch long series in a short time, it is my blessing and my curse.
If I had to choose one, it would be Breaking Bad, by Vince Gilligan, this is the series I liked the most and I really enjoyed watching it, in fact, I decided to watch only 2 episodes per day to "lengthen" its duration.
The story is about Walter White, a chemistry professor who is diagnosed with cancer, because of this he intends to enter the drug business with a former student of his: Jesse Pinkman. In addition, your brother-in-law is a member of the Drug Enforcement Administration (DEA), so you must do all this much more carefully. This is how you end up living two completely different lives simultaneously.
I like evertything about Breaking Bad, character development, the script, the climaxes, etc. I reakky consider it a complete piece of art.