This drama has a Groundhog-type time travel plot where the protagonists have to unravel a mystery in order to save lives. I think that the drama leaves some things unexplained but I enjoyed it a lot. I just wish that they had left the romance out because it did little for me and almost got in the way of the main story. Similarly, the two young main protagonists, as good as they were, were pretty much overshadowed by the acting and experience of the older actors, particularly the mother and father, who were both amazing. I would recommend this drama to anyone who wants a fast-paced drama with unexpected twists and turns.