What to say about this drama that completely escapes the cliché? I have never seen such a complex story in my life, full of plot twists, minutely interconnected events. And the best thing is that even being a story full of details, they managed to show us all these details in just 16 episodes. Your head fills with theories. It fills with outbreaks because all the time you think one is the culprit, because all the time someone appears who took actions that impact the main story. The entire cast's performances were perfect, but the one that caught my attention the most was Yeo Jin-Goo. His performance was FLAWLESS! We could feel from here all the emotions that the character felt through his performance.
Each episode that ended was a different impact.

In short: a perfect drama, with a perfect story, with a perfect cast and a perfect acting!