Love love love the storyline, its not the typical timeslip drama. It makes you think and i rewatch 7x (and counting) to connect the dots of the happenings and each episodes are still so enjoyable.
Casting is perfect. Especially the Kim Hye Yoon. I got glued on epi 1 because of her outstanding performance. ( Watched Skycastle, Extraordinary You, Secret inspector and Joy, Ditto, Midnight, Girl with the Bulldozer and i am extremely impressed with this young actress).
Best drama I've ever watched!!