I highly recommend this drama. Overall, it is mesmerizing and perfect as expected from an OCN's drama. It's an all kill for me !

It has everything. It truly illustrates the power of the south korean dramas and entertainment. I really like how it draws different genres and topics altogether : thriller, drama, justice, suspense, action, murders, bullying, harassment, investigation, corruption, politics, justice, school, workplace and so on. It highlithgts a lot of loopholes of the society. I enjoy the fact that this drama take risks in mixing many genres altogether. The results are absolutely perfect. It is like a mix of the drama "School 2013", "The guardiands/lookout" and "watcher". What I find very interesting is how the story highlithts the hierarchy of classes (the poor should serve the rich) and the existence of bullying in every strata of the society (school, workplace) ! I absolutely adore the story which is well written from the begining until the end. This drama is never boring, not a single second is boring. I could watch it again and again.

Also, the music/osts are absolutely fantastic and entertaining ! I also love the cast which I find particularly brilliant ! Every single actor and actress did so well, even the younger ones (the sudents) did such an amazing and entertaining job I was absolutely mesmerized ! The music is also one of the best point of the drama, every single ost of this drama is very good, it is very original yet it goes so well with the drama. It is very unique, and surprisingly captivating and suitable !

A MUST-SEE !