Since I love science fiction and thriller movies and series. TvN and OCN have a the most extended dramas what I have seen in acting with their story and I could liked it what this type of k-drama will be more famous worldwide and mostrate how k-actors acting is awesome at western society. I wish what this show and others of this channel will be airing on some private cable channel of my own country Spain. The ost/soundtrack is pretty awesome, i liked so much the principal song. The main leads and suporting roles was all fantastic on his work, i can still watch Duel like 2 times in a row and I don´t will boring of look at them. The story is interesing with so much mistery, this drama have all. 10/10, I recommend to all k-dramas lovers.