This drama is seriously underrated. I only started watching this for Lee Jin-wook and Shin Sung-rok, but the characters and story turned out to be beyond brilliant. The overall plot is a heartbreaking tale of revenge that's breathtaking in its scale; each episode is ripe with plot twists - something's always happening - and it's impossible to get bored. There's no romance in this one, but you're watching this for the relationships between the characters, the deception, the thrills, and the straight-up study of human nature and its depravity. TL;DR: This is a good one to watch if you're in the mood to hate rich pricks.