Amazing acting on all fronts (especially Hyun Bin), but I agree with most that Park Shin Hye should not have been cast in this drama. She was too underutilized and there is not much room to ACT when your character barely has anything to do. The AR game is also very well explored and fun to watch, until the second half where every battle feels like a slog. But if they are trying to mimic painful level grinding in your watch experience, then I have nothing to say. Hats off to the action choreographers.

Great soundtrack, each ost fits the scene very well, and Memories of Alhambra's beautifully haunting tune still brings me the chills, 16 episodes in.

And that is about it for the pros. The story is so clumsily constructed, and the show feels like it's trying to be clever without actually knowing how to write a decent non-linear story. You can basically start a drinking game halfway through the show: every time a character sees something shocking, or before a cliffhanger, down a shot. Then wait for the annoying Spongebob "10 hours earlier" chyron to flash across the screen. Sluggishly paced, not much happens in an episode and the show constantly breaks its own rules, or makes up new rules whenever it likes. Half of the cast is completely unnecessary, not enjoyable to watch, and the important halves' characterization is horribly underdeveloped. Might as well use up the same thinking power as Sword Art Online.

Final note: the romance is forced, incomprehensible and inexplicable. He should have ended up with his secretary.