This is one of the best science fiction thrillers I've ever seen. I love the way the screen-writer flushes out all the characters. How or why time is manipulated is extremely intriguing. Characters are wounded individuals trying to understand why they are where they find themselves and how they relate to each other. I have to say that I was so moved by the main theme song, "Red River Valley". It was a song that my family sang when my Uncle visited and would play his guitar in my childhood. The arrangement of the song for this drama actually makes me cry and is so beautiful when sung in Chinese. I can't wait to see season 2.