The overall story for this drama was interesting and detailed, but proved at points to be overly complex. Things got mixed up, characters knew things they shouldn't, some things were linked together by the most tenuous of threads, some things were just never explained and by the end, things started getting downright ridiculous. That being said though, I did overall enjoy this drama.

The idea of the parallel universes with time running opposite to each other was a really interesting concept and I liked it. The split between Mum's World and Dew's World was a cool way to see different versions of the various characters and I really liked how they used color to further separate the worlds. That concept though was also a bit of their downfall as that was where there were the most mix ups like I mentioned before of characters knowing things they shouldn't. However, when they decided to take it a step further with a multiverse and introduce another Mum, that's where it started losing me. On the one hand, I can kind of understand why they may have done it, but overall I feel it was unnecessary. Another downfall with this drama was just how long it took for Dew and Mum to meet in Mum's world. I kept waiting for them to meet...and waiting and waiting and waiting. I wanted to see more interaction between them, of them getting to know each other in their same world. I got the impression the mystery of who killed Dew was supposed to be a big twist and shocker, just from the way they set it up. It didn't seem that complicated to me, I guessed it the first episode, but maybe that's just me. I like figuring out puzzles and I tend to be pretty good at figuring out things like that in movies/shows. The two endings was another unique way to go. I can't say that I liked either one of them. One was depressing, the other overwhelmingly happy, not to mention sloppy. With a drama like this, I think I would have preferred something in between, maybe open ended, or the two at the tentative beginnings of a new relationship. That, however, is just me.

I found the characters to be a little more polarizing in this drama than some of the others I watched recently. Besides the fact that the characters really lacked any kind of depth which was disappointing to begin with, there also a lack of any real character growth, I felt.
-Mint had me going back and forth on whether I liked her or not. I decided that I liked her as a sister and a friend, in those roles she was a badass and I think she would be awesome to have around. But as a woman, I found her incredibly frustrating. Her treatment of Dew basically bordered on harassment with constantly asking him out. I also thought it was absurd that other's got annoyed at Dew for rejecting her and upsetting her when she was literally the one who kept putting herself in that situation.
-Dew was another one that I had some serious thoughts on. While I did overall like him, I did start getting tired of his cowardly nature when it came to Mint. I'm not sure why breaking up with her was so much scarier than being caught cheating, but apparently that's what he thought. It was just kind of weird to me that he wasn't afraid to face down his uncle, but telling a woman he doesn't actually love her and wants to go back to being friends is impossible to do.
-Mum, there at the beginning, I was not a fan of his womanizing ways and I was gladly that was a relatively short lived part of the drama. However, it was disappointing to see that whole "only gay for you" trope still being used at this point. Come on, guys, you can do better.
I didn't have much of an opinion on the remaining side characters. They were entertaining for the most part, but nothing spectacular. The secondary couple was kind of cute, but also didn't add a whole lot. On the plus side, they also didn't take away huge amounts of screen time either.

The acting wasn't bad, nothing spectacular. Ohm and Fluke don't have the kind of chemistry that will start a fire, theirs is more subtle, but I do feel its there and they do work well together. Also, can I just take a second to comment on Fluke's smile? I swear that boy could charm wood.

The OST was okay, again, nothing spectacular. However, I did love the opening credits. I thought they were a visual masterpiece, just gorgeous visuals, I loved it.

I'm rating this drama higher than it really deserves. It was simply too ambitious and it has a lot of flaws, but despite those flaws, it still managed to capture my interest and overall maintain that interest through to the end. I also absolutely have to give credit for an interesting idea, even if it wasn't executed to its fullest or best potential. I don't think this is a drama worth watching more than once really. Once you've seen it, the mystery is gone and I feel like the errors will just really stick out more than anything else, but its a fun one to watch just the once.