This series could have been another common revenge story...Instead, it turned out to be the captivating first part of a cruel tale amazingly acted. The script was well-built with effective setup payoff and credible plotlines. The well-thought pacing creates a very bingeable show. The tone of the drama is really dark making the few instants of respite and hope really bright for the protagonists.

The ensemble cast is great: most of the actors are doing an impressive job. I found the younger characters particularly gifted: each of their scenes left a strong impact on me. Song Hye Kyo successfully plays the complex (anti)-heroine. The performances of the others characters (allies and enemies) are not to be outdone either. I totally fell for the charm of Lee Do Hyun and will be looking forward his new -(and old) dramas.

The production is really great, there are a lot of scenes that are poignant and even harrowing for your soul while still at the same time being beautiful and healing in some way. The opening generic is fascinating as well as the overall soundtrack, haunting at some points.

I would recommend this to people looking for a captivating revenge drama. If you like dark stories and have appreciated thematic around social classes like in "Parasite", this one is for you! Be aware that this is a really brutal story which can be very triggering as it is centred around bullying and very violent.