This sci-fi/action/thriller movie raises the questions we've been asking ourselves since antiquity: What is life and death? For what purpose do we live and what happens after death?
Both the lead actors (Gong Yoo & Bo Gum) ponder about these things and portray their emotions beautifully while doing so. This philosophical matter is amalgamated with some powerful action sequences in this movie. Didn't like the ending, though. It felt too abrupt and forced to me.
Nevertheless, the splendid performances given by the lead actors as well as all the action will make your eyes glued to your screens till the end.
Highly recommended to all!