Story
The story is about politics, corruption, a dysfunctional family, and revenge. The story is also kind of like a fairytale. Wherein the female lead is taken captive by her evil stepmother and the male lead is her prince charming. The first half of the show is good. It all went downhill when the female lead took the spotlight away. Her character is so dull, boring, and annoying. She is like a filler in the story. Her romance with the male lead was forced and was unnecessary. The second female lead (Choi Yoo Jin), on the other hand, nailed this one, what a phenomenal acting. Her character is very well written and is one of the best antagonists ever. 

Cast and Characters
• Ji Chang-wook as Kim Je Ha, or K2: His action scenes were entertaining. He had better chemistry with Song Yoon-ah, despite their age difference.
• Yoona as An-na: Her acting is totally fine with me. The problem is with how her character was written.
• Song Yoon-ah as Choi Yoo-jin: Hands down, she is the best actor in this drama. She is a fantastic actress—one of the best, actually. She totally nailed it. You will hate, but at the same time, pity Choi Yoo Jin, and you will root for her despite all of the horrible things she has done.

Music
The music is good, but forgettable.

Overall
Watch it for the actions scenes and for Song Yoon-ah. She made this her own drama with her excellent acting skills.