I had dropped it halfway when the drama was first released. I just recently picked it up and binged the whole thing and, honestly speaking, I don't regret dropping it in the first place.
For new actors, their acting was good and they played their roles well. I especially like the OST, they fits the theme so well. But those are the only good points of this drama.
Up until episode 5, everything was great but then the plot just developed in a strange direction that I could not wrap my head around it. New names kept popping up unnecessarily and various scenarios laid out in front me that I almost lost track of the main problem. AND!!!! They tried to end everything that had happened in the last 11 episodes in the last half of episode 12?!?!?!?! A lot of plot holes and loose ends that my mind just went "???????"

Give it a try but don't keep your hopes up.