Well as we all know, remember this movie is fiction, didn't claim to be based on a true story except the movie is based on a real king and weapon. The only accurate thing in this film was making the weapon itself. Haven't we seen movies that done this before? Like Wild Wild West? The only problem thing for me is that Ming and Korea never went to war with each other. If u r just looking for the entertainment like sword dashing action and explosives, then this is the movie for you, BUT if you are a history buff or Chinese, its best for you to avoid this...or better yet hate it, if you do watch it though...don't think Koreans are trying to change history, if u want to watch something more accurate then I recommend watching some korean historical dramas or documentaries...they respect history more than this film...that is not the aim of this movie, its trying to stir and exploit korean nationalism as well as giving good entertainment action. :D