Amazing chemistry followed by mediocre plot?

Usually I have no problem if there are some unhealthy aspects in the relationship of the main couple, but when all the relationships in a show are toxic at various levels (or at least questionable), I might be disappointed.

THE GOOD
Realistic and flawed characters. And oh boi they were flawed. My blood boiled more than once while watching. It did make the story more probable in my eyes though. The bad characters were truly villainous. If you need to find a nice example of a psychopath, you can find it here.
True diversity in female characters. It was not just a bunch of fangirls running around after hot guys, they all had their own personalities and motivations. The chemistry, as I already said, was amazing, but not only between the couples, but also the group of friends - it had such a realistic feel to it. What's worth mentioning: development of some minor characters and how their behavior was turned into these small plot twists.

THE BAD
What was Bright's character? I'm sorry, but damn I hated him badly. The age difference in looks between him and Farm freaked me out so bad so many times. It didn't feel like a dude using an innocent guy, but rather playing around with a child. And while I appreciate where it led Farm's character (that was extremely realistic), I hate how it was not really addressed as something bad by anyone.

THE QUESTIONABLE
As I said, having some questionable things going on with the main couple I can deal with, quite realistic. There is a whole different story when there is literally not even one normal, healthy relationship in the drama. When the most typical and not-problematic one is a student going after his professor... I'd say you have overused the dramatic plotlines to get your viewers interested.

Overall, I did enjoy it, binge watched it in two days. The additional commentary from the subber did make the viewing experience better tho :)