You may wonder about the rating - I didn't check why, but a drama usually does get lower ratings, because ... you know it's more story driven. This is both story driven and character driven though ... and there is a fair amount of sex/intercourse too. Which includes nudity and some violence - just making sure you are aware of that.
The acting is really good and while you may not feel any love for the characters or their behaviour (no pun intended), it is quite the intriguing story it tells us here. We know this is something that shouldn't be happening ... but we also know that certain things seem impossible to avoid ...