This had a really good cast, but a really poor storyline. Surprisingly, as one of the strengths for Korean dramas is the ability of the writers to really develop the characters. This fell very short of that strength. The first couple of episodes were strong, but after that it just went downhill. For me, the weakness was in the believability of the characters to handle their lives. They seemed exaggerated, rather than human. Park Seo Joon's SaeRoy just wasn't believable. To go through what he did and endure such injustice, then behave so apathetic and stoic just wasn't believable. The same with Yoo Jae Myung and Ahn Bo Hyun's characters. To kill someone's father then go after that father's son, unjustly sending him to prison, then once released going after him again for even more vengeance just seems unbelievable. This was a revenge trope theme, and there are a lot of these type of dramas coming out (i.e. Reborn Rich, The Glory) that have stuck with the main plot, yet allowed the characters to show some humaneness even as they are enacting their revenge. I think where this drama failed was the main characters were way, way too exaggerated in their roles, and the supporting characters were way, way too subdued and neither were ever fully developed.