NewFan

I got into it after 4-5 episodes, first ones were not awful but not super good too.
Romance was sweet, they were worrying about stuff too much in the last 3-4 episodes though.
Im glad there were many sweet moments through the whole series, I hate it when sometimes you get no romance for 90% and then 1-2 episodes in the end only.

Main male characters were great overall, loved them. Female lead character was kinda annoying for me (especially at the very end), she was so pushy and loud omg :/ But the actress played it well.

I found it fun, but also tiring and stressful to watch.
Why?
I felt like the actual romance that I enjoyed watching started in the last 2 episodes. It was too much drama, too many problems on the way and well...
I usually prefer it when two people just love each other and there are some problematic circumstances they try to overcome.
In this drama it feels like they just miscommunicate and create problems on their own all the time. Its good when it happens once, but it was tiring to bear with it in the end.
Also the ending was just okayish. I didn't like it that much.
Actually the drama ended just when it started being fun, so when the main couple got together.

I liked both leads, but I prefer main one. Overall I had fun with this one, but I would change some things to make it truly enjoyable.

First 2-3 episoes didn't get me in but later I really liked it! I liked both lead males but I liked Jung better, I think I could understand him better, shame he didn't get more screen time. My heart was broken about all unfairness in Baek In Ho, his sister deserved a lot of what she's got, but he deserved almost none of it (almost : P).
I liked main couple and their romance. Might have been awkward and weird in the beggining but I think it grew pretty well.

I wished for better ending. Ending isn't awful, its open ending but it doesnt feel satysfying.
I enjoyed it overall.

One thing that REALLY bothered me... Is it normal to call someone "senior" in Korea after dating them for a half year? It was like he was nameless. I mean like really... That was annoying me, because seemedso out of place. Is it normal in Korea or what?

The drama is not the worst, but I couldn't get into it that much in the beggining. I had to take breaks watching it.
What annoyed me is look of all main characters, they just looked too old for highschoolers to me.
Especially Lee Min Ho as Kim Tan. No idea what actos ages were back then, but I felt he's an adult man who tried to fit into highschool clothes. Not that I don't find him handsome, but just not fitted for this role.
Main female had also very boring character most of the time, I couldn't get over it.

Edit: After completing it all I can say that after around 4-6 episodes it got better and better.
I ended up loving both male leads in their roles (heroine character was still kinda meh, but not as much as in the beginning) and support pairings as well.
But I hated the "reasons" main couple was on and off together. There were no real reasons tbh, just made up things, she didn't want to share with him what is going on, like she didn't trust him up until the end.
What I loved is the sweet couple moments, there were many of them and very cute. A little more kisses etc than usually in korean drama's.

I honestly liked both guys per se, it's just...
I didn't see their connection. She might have liked him, but he?
For me he liked her as long as he thought she's her sister. Then wanted to cut ties with her (he liked her as a friend, so was torn, but I didn't see it romantically), but when her sister came back he suddenly decided he likes her too. It feels like he just liked her because she looked like her sister and was nicer to him.
And starting a relationship with someone who liked your sister for 10 years and now suddenly likes you is... well weird for me. Just ugh, I'd never want to date a guy if he chased after my sister for 10 years and then decided he likes me, especially if we look the same, seems like kind of rebound.
The other guy was always there to help her, was sweet and caring and they had many cute moment's together. Seems a lot of people have this problem, like me, but I'm glad you and many others liked it and saw the chemistry. I couldn't.

I am honestly not a big fan of love triangles after all. Too many real life situations like that I happened to be in, when someone always got hurt, it breaks my heart.

I would love it, but the love choice seems out of the blue to be quite honest.
Why build relationship all the series to then choose the other guy? For me she had no emotional connection with him at all : p
I was super suprised because I honestly didn't even see this as a love triangle for most of the series because the choice seemed obvious for me. It was a suprise I didn't like.

Loved it!
Both main leads have super cute smiles, their relationship was perfect. I don't usually like love triangles but it was handled very well, I loved both guys. I cared for all main characters, not just for main couple and that is pretty rare. Bromance was on point too :)
The only minus would be that villans were super stupid. No idea why so many dramas portray them that way.

Are there any school drama's with as good romance as this one? Only School 2017 was as good for me right now. I have problems finding something I'll like after these 2.

I loved the main couple relationship, it was soooo good. Full of giggling, smiles, teasing, jealousy and passion. And there was no love triangle , which is also a big plus!
Kim Jung Hyun is sooo handsome and has such a cute smile.
Plot was ok, most of the time. Wasn't the greatest plot ever, but wasn't bad too and it wasn't silly( I am very thankful for that - a lot of korean drama's are a little bit too comedy and silly to watch for me).

Are there any school drama's with as good romance as this one? Only Cheer up was as good for me right now. I have problems finding something I'll like after these 2.

The only minus is that villans weren't too good. I'd prefer them to be a little bit less stupid. BUT it wasn't as bad as with most kdrama's anyway.