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This drama was great and so thrilling, such a shame that this is such an underrated drama :( It's quite a unique and new concept of time-traveling and they delivered it well. Not too complicated, but still something you can't easily predict, but still made sense. I love how they didn't force this to a full episode drama, (which usually is 16 episodes) but chose to make it 12 episodes only, which is perfect! Every episodes were compact, to the point, and very intriguing! It was so thrilling and you can't easily predict how the story is going to progress. Love the chemistry between Lee Joon Hyuk and Nam Ji Hyun so muchhhh it's quite a shame that they didn't have more scenes that indicate they have some kind of romantic relationship, but it is very understandable as their current situations were too complicated and confusing so they can't possibly have romantic moments. But I'm still satisfied that they still got some cute moments together hehe.

It has been on my list to watch for quite some time and I'm very glad I finally watched it!! Great casts, great acting, great storyline. Even though this drama was quite heavy on the political talks, which, about 20% of them I can't understand (lol) but it doesn't hinder me to grasp the whole picture and it was a very good and underrated drama!! It's a type of drama that you can't predict what will happen next, and that is very my cup of tea! Very very good job for all directors, scriptwriters, and all other staffs, and of course, the casts! Love how the casts still keep in touch even though it's been years since this drama finished shooting. I'll be very interested if they can make a season 2 of this drama!

[spoiler alert] I would've rate this a 4.5 star because I LOVE Joo Won's acting in this drama, it was top notch! I can't quite fathom how he can act as a 19 year old boy and it fits sooo well wow! Not just because he - indeed - looked young, but it's because his facial expression somehow oozes out a 19 year old boy (if that makes sense haha). But the ending really threw me off though. It was just like none of the other characters really mattered, only the 2 main leads. Most importantly, it is so weird and wrong on so many levels that they made romantic relationship between the mother (well, her past self) and the son. Like c'monnn writers even though at first the past-self mom didn't know anything about their mother-son relationship, but the son always looked at her like she was his mother. Why do you guys ruined this drama by forcing them to have romantic relationship :(( I thought at least at the end Jin Gyeom will end up with Do Yeon :(((( It was actually a roller coaster ride watching the whole drama and it is very intriguing too. But partially I guess because you just can't really understand the theory/logic in this time travel/multiverse-themed drama haha. It's such a shame the writers made the theories too complicated - either they can't explain it well to the viewers, or they just can't make the theories logical enough to be accepted by the viewers.

This is a must-watch drama for sure!!!! When I first watched this drama I didn't expect much because I didn't watch the teaser/trailer first. But damnnnn even the first episode got me hooked so much!! The plot is great, the actors' acting are great, the computer graphics are crazy real, just, WOW. I love how I got mindblown and shocked (and also cried many times) by the plot if this drama. Although I must say the ending is confusing and such a cliffhanger! :( But even tho the ending is not a satisfying finish I must say this is one of my favorite dramas. Great great story!