Your introduction was exactly how I felt awaiting for this drama. But after watching it, my opinion is a little different. Ok, the story was not that bad, although this time-travel thing is being repeated too much lately (Kairos, Times etc). And Cho Seung Woo's acting could never disappoint me (but can't be compared to "Stranger" performance). Park Shin Hye on the other hand...I was never a fan, but she was ok when supported by strong leads (Lee Min Ho, Hyun Bin) in romantic roles. In this drama, although her action scenes were good, the emotional ones were very weak. I liked second leads' performances a lot, almost all of them, they really helped the drama's quality, just as much as the nicely filmed action scenes. Overall, the drama wasn't what I expected, but I loved your writing in this article!
A great drama with an interesting, solid and believable plot, wonderful performances by the entire cast, incredible ost and a worthy closure! Loved watching this!