This is a good and entertainment watch for a short drama. It has nice quality, good vis-dev and interesting plot. The concept of parallel universe in comic universe isn't anything new, but it's still little used and has a great potential. Within such a fictional world when an author can set any rule and doesn't make them any logical, you can push the story how far you like. That's why the concept is interesting - the plot is unpredictible because it doesn't have to stick to true world's rules nor logical sense. I wish they would push it more in this drama. When I started watching it, I really hoped for more ridiculous, surprising turn-overs and I wouldn't mind plot wholes. Sadly the story writers decided to play it safe. There could be more fantasy elements and comedy - instead writers focused on the fast paced plot development and it didn't give justice. I feel I didn't get the thing I was looking for in this drama.
What's more to say... The pace of the story is good. It looks like a drama with fine budget. Actors did fine job. Characters were interesting. It's an entertaining drama to watch in around 4 hours. Not too long, not very short, just fine. In my opinion, there are still things that the story might use for the plot, to show us more. If they were to make 2nd season, I would definitely watch it.