I loved the story of Nai and Gump and their friends. However, I felt a lot of their story was a bit rushed and I can understand, since it's a movie and not a series. There is a sequel and the only thing so far that I don't like is that the actor that plays Gump isn't the same actor in this movie, just be warned.
The story made it seem like Gump was only Nai's tutor, until he gets into a fight, and then magically Nai starts to like Gump. I only wish they made the movie longer and had more moments with Gump and Nai.