Just my personal opinion. I started this series just because of kim yoo-jung. But ended as a fan of Jo Hye Joo. Even though she only had a few scenes her screen presence was good.
Acting wise main pair was not good at all. May be production team might have thought like they can sell this drama based on looks of lead pair. As usual Song Kang again shown us that he is only good at make out scene and not in acting.
VFX was nice. Even the OST.
Kim Tae Hoon, Kang Seung Ho did a fantastic job in this series.

I would say this again : :D Special mention to Jo Hye Joo, she should get a main role drama soon. She was perfect.

I wont suggest this drama to a any person