Such a wonderful kdrama!! The connection to their past is written incredibly good and not to mention the OST. I really love how they were entangled in their past lives and how they discover their connection and just everything...
I can't describe it in words, just go and watch it. I give everything 10 out of 10.
It's suspenseful, fun and evokes some sad emotions in a good way. It totally has 10/10 rewatch values although I haven't done it myself cause I usually don't rewatch any kind of dramas, movies etc.