One of the best thriller drama series of all time. It’s also one of the best parallel universe, switching characters type drama. I really want a 2nd season for more development of the world and the characters. There are so many possibilities left to explore. Love it.

Everything about this drama is top notch, from the tight plot, beautiful writing and great acting. I wish this is a 16 episodes drama, so we could get a deeper exploration of characters and plot.

Every episode left you biting your nail waiting for the next episodes to be available. The suspense was intense and intriguing. I love the concept of how the parallel world actually work. There are so many small things that seems insignificant the first time around but it’s actually a clue to the bigger picture. So beautifully written and executed.

I love how they show and explore both world, how one single action could lead to such a different outcome. The color palate they use in each world is different, and it really enhanced the viewing experience.

The difference in each world is subtle in some aspect but significant in other stuff. The difference also shows in our characters, because they experience a different life, they have different personalities, but fundamentally they are still the same person.

This is not the first time Yoon Shi Yoon play as two different characters in a drama, I first show him do it in ‘Your Honor’ where he play as twin brothers. I think his acting here is so much better then before, in ‘your honor’ he over act a lot when playing one of the brother, while here, he played Do Won characters with subtle differences that’s more enjoyable to see. I wish they could explore more of the background story of Do Won from the other world, he seems so broken and jaded, that I want to know more about him.

Two thumbs up for Kyung Soo Jin as Han Seo Kyung. Her portrayals of Seo Kyung characters in both worlds are really good. Really love her characters in both worlds. Just wish they have more episodes so that more of the characters from the alternate world could be explored more deeply. All the other actors also portrayed their characters so well. It’s a really good casts.

The musics are really good. Love ‘I will never’ by Joe Wonsun and also ‘with you’ by Oo. All the background music also build up the atmosphere really nicely.

I will rewatched this series, I will be looking at all the difference between each world and also looking for the similarities. I would also look at all the crumbs of clues splattered across the episodes.