I actually marathoned this series in what I think was about.. Less than 3 days? It's very gripping and you just find yourself keep watching to find out what's happening next. Its plot is unpredictable. As viewers we've seen enough dramas to try and predict what would happen after a certain development of an event. But the drama plays to none of the usual plot trappings. In a way, its storyline takes on a concept that is extremely unique to its own. Granted the fantastical element of the story leaves you pondering about the logical conundrums of such a scenario. But the drama makes no apologies for it, in fact the characters themselves recognise the absurdity of the situation. What the drama does well is not overexplaining how it came to be, but putting out the premise for the viewer to accept it as it is, and then utilising the walkie talkie seamlessly as a plot device. The drama draws you in with the storylines and all its characters. Acting was absolutely fantastic. Even Jang Hyeon Seong, the great dad in TROS, plays such a convincingly despicable character he was thoroughly repugnant. All in all, I would say this is an extremely well executed drama, ties up everything it's supposed to tie up without it feeling rushed. (I for one feel the ending was appropriate for a 16 episode series, though I also do entertain the possibility that they could have extended it to 20 episodes and truly conclude the entire story once and for all, but of course we don't know what the writers' intentions are). You can't really stop watching once you start, so brace yourself. Will really like to commend the scriptwriters and actors for such a great job done. It was very a enjoyable ride indeed.