My reviews are not usually long but for this drama.... I have a lot to say.

The overall story was a good concept. There was a parallel universe with some minor/major differences and a portal between the two, not a bad idea. The characters, however, the characters and their relationship... not very good. The main romance has got to be one of the worst relationships I've ever seen in a drama. Their chemistry was awful. They never got a chance to develop an actual believable relationship. When she found out that everything he was saying was true, she immediately fell for him. Like?!?!!? In the beginning, she is seen as a strong female that won't take crap from no one, yet here she is falling head over heels for this man she was literally hours before, calling crazy. I also cannot count how many times there was a scene where she was crying because she missed him and then he shows up and there's a slow-mo scene of them running into each other's arms. Normally, that would be cute. Here, it's cringy and repetitive. The only chemistry they had, was at the very last episode. In my opinion of course.

Main couple aside, the whole arc of time travel was also awful. Surprise surprise. Time travel is not that difficult to understand, but I can see why it's hard to write about time travel. Even though it is difficult to write about, that is no excuse for how the drama played out. To me, it was just lazy writing.

The Prime Minister! Oh, they did her dirty. I never hated her, I never thought that she was a bad guy when it was so obvious that that's what they were trying to push. To me, she just seemed like a person who had goals and would do a lot to achieve them. I didn't like the ending they gave her, it was a bit disappointing. She could've easily been cut from the drama and it would be exactly the same.

Product Placement! There was a crap ton of product placement and I think everyone knows that. I personally think that product placement in dramas is hilarious, it always gives me a good laugh when I see how the writers wrote the product in. This drama, though, had soooo many product placements. I've seen a lot of people complain about it, and while yes, it was at times annoying, people gotta make money! Maybe they were greedy! Maybe they had a reason! Maybe they didn't! Oh well! I wouldn't say that it absolutely ruined my watching experience, it really isn't that big of a deal. But I know it is for some people, so if you hate that sort of stuff, don't even bother watching this one. I don't think I've ever seen another drama with this much product placement.

The best positive! Joyeong and Eunseob easily the best characters in the show. They're complete opposites but are still equally as lovable. You got Joyeong who's firm, has nice slick hair, and speaks formally. Then there's Eunseob. He has messy hair, is very fragile, and has one of my favorite accents ever. I freaking love it when he speaks. Now THEY had personality.

The soundtrack was beautiful and played at the right time. Sometimes it would make the scene 100% more dramatic or emotional and it was fantastic. The Fantasia of Another Dimension was incredible and makes me want to cry whenever I hear it and Orbit by Hwasa has got to be one of my favorite kpop songs of all time. There was one song that seemed out of place and I didn't like it at all. But that would be the only one.

One last thing. I believe that the cast was great, great choices with great actors. However, most of the characters were bland. It doesn't change the fact that they are good actors, but it didn't save the drama either.

I don't believe that this is one of the worst dramas ever. Did it suck at times? Yes. However, there were some times when I was looking forward to the next episode. And there were even times in which I enjoyed watching it. That's why I gave it a 6.5. To me, 6.5 is not bad, it's not good either. Equally bad and equally good in my opinion. And while I give it a 6.5, I would definitely not recommend this drama to anybody.