The story is good in theory. Clichéd? Yes. Unrealistic, even by K-Drama standards? Yes. But it's a fine story to have these characters interact with each other. However it's lacking substances and sense at times. Characters say things just because. Suggested feelings disappear suddenly (Hyun Min not being interesting in Ha Won suddenly was a total mind-f*ck for me. They set up another person to like, which is a mess of a plot by itself, but they have big relationship moments for the first quarter of the series before it's dropped). The title is misleading as there is no 4th Knight. None at all. It's a clever name but it makes no sense. It's not even hinted at as a possibility either. The family abuse plot is irritating for all the wrong reasons. I swear it was only there to draw further comparisons to the title name. One thing I do think is done well is Ji Woon's arc. Whether it be the main relationship with Ha Won or his struggle to accept that he is now apart of a rich family and has expecations to uphold, I thought that was something that you could bite on. The bastard child trying to reject his family instead of the opposite is an interesting plot. He and Ha Won work best out of the three potential guys too. Again, the Ha Won/Hyun Min plot is dropped in a jarring way to the point where the love triangle no longer exists past episode 5/6 but they went the right choice for who is more suitable. Seo Woo is a cool character. He's talented, smart, has good intentions but he does feel like a lost wheel and unnecessary as a whole. The plot is just riddled with problems. The characters are fine enough to keep you engaged for the whole runtime, even if they aren't given much depth. Oh well, at least we have Kim Yong Gun in his natural role as the malignant CEO Kang to keep some consistency.