This first episode from start to finish was quite impressive in the way they brought in all the main characters early on, and set the tone for the rest of the series. Choi Jin-Hyuk is an incredible actor, with great charm and aggression for those of you who recognise him, and Lee Min Ho's older brother from The Heirs. Park Sung-woong playing his typical specialised role is perfect for his character. My only concern is seeing how the rest of the series plays out, seeing as the main story line has been revealed. Overall, wonderful fast paced action series, with cool Sci Fi themes. This is one of those series that you want to binge watch, but don't mind anticipating, and guessing the themes each week.