There are a couple of things that I didn't like.
They did a great job of creating the atmosphere and setting the mood for most scenes. If I had to choose something memorable, I would have to say the music really stood out the most. The atmosphere, character, and the cartoon style sort of resembles How To Train Your Dragon in many ways. What I mean by that is when a character is cut, they do not show any blood or the wound and they do not die in any gruesome type of way. To start off, I should warn you that there are deaths in this movie, but the fighting and deaths scenes are very contained. Everything was explained well enough throughout the movie that you will follow along just fine.
Don't worry if you've never played Dragon Nest before, you do not need to know the story of the game in order to follow along in this movie. What interested me about this movie was that I've played Dragon Nest in the past and I was interested to see what the movie would be like. As a 23 year old, watching this movie was much more enjoyable than I thought it would be.