I personally think this drama chooses its audience because of the unique story line that the writer chose. If you're not into the mystery solving and critical thinking, I think this drama is not for you. This drama makes you think a lot especially when you reach episodes 15-18. It will really blow your mind once you get there. But before you get there, you'd feel bored, annoyed, confused, whatsoever. In my experience, I got bored while watching the middle episodes. I lost interest in watching the drama to be honest. But the first few episodes were good actually that's why I managed to cope up until episode 8. But starting from there, the progress went slow and it took me a long while to finish the drama.

As for the acting, I still don't like Go Ara's acting ever since I've watched her in Hwarang. I don't know if it's her character or what, but her facial expressions doesn't buy me. Instead, I was rooting for Lee El's character to end up with Seung Heon's character. That's one of the reasons why I disliked the middle episodes. After reading some reviews after the drama ended, I gained some encouragement again to continue watching the drama. True enough, the episodes 15-18 reveals everything. The plot twists were crazy, it really blew up my mind. That's when I realized that this drama chooses its audience because the flashbacks are real. You have to pay attention in all the details every episode because it will all connect at the end.

If there is an award for the Best Plot Twist, I would want Black to receive that award because the plot twist was really insane. You can never trust anyone that easily. Despite my annoyance with Go Ara's acting, I still give this show a 8.5/10 rewatch value because of the amazing story they got here.