There's something in literature called "Catharsis", which is the process of releasing, and thereby providing relief from, strong or repressed emotions.

For once (I weirdly admit), a literary term was useful enough to describe something I went through.
This drama was a rush of various emotions. No episode ended without me having to hold my breath. A lot of times I literally had to scold myself to put down the device I'm watching on and go to sleep.

Okay let's go one by one explaining likes/dislikes about it:

Story:
The plot was very captivating I admit. It was fresh and overall different from usual twin-switching-lives sort of thing. The complexes they faced were twisted nicely, and the pace of their revelation was well planned as well. You barely have time to find release after taking care of one problem. They knew how to keep you on your toes that's for sure. It was really stressful at times, but after the problem is taken care of you will just feel even more connected to the characters. All in all... It was adorable and I certainly don't regret watching. However, I don't think I can re-watch it. At least not any time soon. It's the type of drama you love and wouldn't mind watching if it suddenly appeared on TV, but you wouldn't do it willingly. Or at least I wouldn't, because even though I already know what will happen, it will still be stressful for me to re-watch and re-live some moments.

But.... I might be willing to watch it and skip only to the cute adorable moments :)

Characters (Acting/Cast):
I don't really think I have anything bad to say about any of the cast's acting. They all acted their part very convincingly, and some even, very cutely.

The lead actress though... She's no joke, that's for sure. She was amazing in both her parts. The way she displayed each of the twins made it very easy to distinguish between them. Somehow although they look exactly alike (and obviously are actually the same person) I find it at times hard to imagine that there weren't two different girls playing those parts. I know this will sound strange and I'm not sure all people think so, but she has the prettiest grin/smile I've ever seen a female actor have. I also like how her character was not mean to the lead she did not like back and didn't push him away like how leads tend to do in dramas. So yes. I like her. I in fact look forward to seeing her in more future dramas.

I also liked seeing Kim Joon Seok play the part of the homeroom teacher. The role fit him like a glove and he was so adorably funny. "That wasn't it was it?" haha this line always cracked me up. You'll understand once you watch it.

The two leading actors were very lovable and cute in many ways as well. It's my first time seeing any of them in a drama but now I'm pretty much fishing them out to see what else I can watch for them.

As for the antagonist (The person who apposes the main character; aka, the main "villain"), she annoyed me to the point where I literally kept glaring and making scary faces at my screen (which means the actress did her job greatly at performing her role. Applause). I really haven't been this annoyed by a character for so long. In fact, so far I think she's the most annoying character I ever stumbled upon. But, I did feel bad for her at the end.

The class as a whole were likable. They pulled through together till the very end, and had memorable moments. It gave me goosebumps. (And apparently it gave them too lol)

Music (OST):
There are three Ost songs I MUST have on my phone (in fact, already have one)
They are "Reset"
"Blowing in the wind"
"Return"
I don't know about you guys, but these songs are awesome!

My only tiny small slight disappointment is in the final pairing. I personally found more chemistry between the lead actress and the one she did not end up with, but not to the point where I'm really hateful of the actual pairing. I find the actual ship cute together. It's hard not to when both male leads are lovable. And some might even disagree about who's chemistry was better. It's a matter of taste and opinion.

So overall I DO recommend this drama. The journey although was a bit stressful, it was memorable and enjoyable. I don't regret a moment I spent on it. Hope you won't either.

OH OH final warning though.................

Prepare some tissues.

I don't know about you but I've used a whole box of them.

Maybe I'm just overly emotional when watching dramas who knows *sigh*

Anyways, take care! have a nice watch!!