Don’t understand the low ratings!!

I was hesitant to watch this but I’m glad I did. I haven’t come across a good modern series lately. All I’ve been watching for the past months are historical series.
I couldn’t stop watching this, even though I hated the female lead, but hey that was her character/ role and yes this some what reflects real characteristics you come across in real life.
I like the story and action, don’t know why even though it’s not thrilling or suspenseful but it keeps me watching nonstop?!
Haven’t read the spoilers but hoping for a happy ending.