I'm not the type who watches sci-fi genre but I give it a try because of Rae Won, and I don't regret it. The story is actually distinguished and unique and the visual Fx is so well doned, the acting cast is skilled too. One thing that I don’t like that there's unnecessary lengthy scenes that make me feel bored. It's a nice drama with an addictive and magnificent story that will make you looking forward to the upcoming episodes. I get astonished whenever I see Z-O's lightning superpower, it's amazingly beautiful and I bet that they put a really effort to make it in this level of wonderfulness.