Reviews are contrasting indeed, some saying that the total 2 seasons of the series are not worth watching but I disagree. The story, acting, and plot twists are much well executed! Each moment for each episode isn't dull and will leave you yearning for revenge more. For the writer, I could understand why there is a need to introduce such dynamic display of plot twists and some events (which could have unrealistic tones to some pips) - this risk by the management is definitely worth it - it gave the thrilling series life, color, and complexity - unmatched by any other kdramas.
If you're still doubting about watching the show, just remember that the writer for this drama is the same one as for the penthouse - and though some reviews state that the writer made the wrong choices of plots - as one who watched truly the show from start to finish, S1 and S2, I could say that it is indeed worth watching! The atmosphere and feel of the penthouse is carried into this drama which gives its executive and award-winning vibe. What are you waiting for? come and watch this show now!!!