Impossible not give a high rate on this one. I came to watch this because I was too lazy to find something else, and thats what netflix showed me first.
I never imagined it was so freaking good.
Is a light history with a simple plot. Is the kind of drama that makes you reflect your own life, and life in general, in a very cute way, thats why is I like it.
One of down-points of korean romances in general, in my point of view is repetition and cliche. I like it but if you watched some korean drama, you know
what I'm talking about, but not this one.
The female lead. I love her. She's the best female lead Ive ever watched in korean dramas. I dont know if I like her because she's somehow like me in real life haha, but I love her. She's not drown down in gender cliches like most female leads in korean dramas (well 1 or 2) She's strong, straight forward, and tempered, yet funny. There's no drama revolving around her. She's just simple.
The male lead. The guy is hell of cute, and yeah call me shallow but having a cute male lead to me is important. This is entertainment, and cute faces entertain me.
But nothing comes with a cute face without acting skills(like that guy from heartstrings, he was pretty cute, also looked like a robot, expressionless) This guy acting was great. The character itself, confused, lingering in a sort of platonic love for so much time, having trouble sorting things out with his older brother, and his personality, he was sweet towards her most of the time, even though she never knew about his feelings.
The side Histories. They were cute as well and not a pain to watch. I know many people like side histories but Korean dramas, mostly are BAD in it. Most of Korean dramas Ive watched, with side histories, sometimes it becomes so fucking boring and irritating that I just skip it. Not this one. The side histories, as well the characters, well written, in a way you don't dislike any of them and you want to watch it, not skip it(in my case) .

Final considerations.
Well, this a light weight sort of slice of life, with cute romance in it, with a strong female lead, a sweet boy male lead, a crew of fun friends. The history doesn't follow a straight line. It goes sometimes only tell fun situations that isn't related to the main plot, but it's extremely fun to watch, at the same time.
It's a light weight drama, but now a shallow one. It's deep, makes you think about the word and life works, if pushes you inside of screen.
Is it worth watch??
Well, yeah.