When im at episode 3 I think if should i continue it or not because it didnt caught my interest at FIRST, but when i have nothing to watch anymore korean shows with scifi/thriller i think its maybe worth it to continue, So i did and oh my goodness i made a good choice.. The storyline at the last 2 episodes maybe tricky but you will understand soon.. As a fan of sci-fi i really like it and im hoping for season 2, for the people saying they dont like the show and dont get it i really dont understand why some people cant catch the idea/storyline.. All i can say is they made a super amazing job at acting and of course the storylines.. THATS ALL (Sorry for my bad english) :>