Really enjoyable movie, especially for casual watching. I started watching because I liked Song Joong ki, stuck around for the story and the other actors. The story is a bit slow and predictable in my opinion but enjoyable nontheless. I was especially impressed with the special effects and the action scences. The CGI was very realistic which is really crucial for sci-fi themed movies. Although it is mainly an action adventure movie there are many emotianal scenes, during which I definitely had to cry. Highly reccomend