I'm so obsessed with this drama. I loved everything about it especially all the action scenes and the emotional scenes. Every scene managed to tug a few chords in my heart. It was very touching. Only thing that kind of bothered me was how quick the love story went about. It had weak emotional build up yet the romantic scenes were so cute and heart warming, if only there was a little more emotional depth. But I live for romance and all the cute little scenes between Im Yoona and Ji Changwook made up for the little lack of emotional connection between them. I absolutely loved Im Yoona, Ji Changwook and especially Song Yoona. Song Yoona depicted the antagonist so well, I could truly feel the character's pain which is why I was routing for her. That's very rare to be favoring the antagonist, so Song Yoona was a success. Im Yoona was incredible as well, it shocked me. I found myself crying every time she was, her acting made everything seem so real. Ji Changwook as the bad but good guy had already swept me off my feet. Overall, it was so heart wrenching, I truly enjoyed it. If you want something heart wrenching but full of action this is definitely the show for you. I absolutely loved it.