The Story/Theme
I loved it, it's really realistic and at the beginning its a fresh youth romance without big problems, but its getting deeper with daily problems after a few episodes, when they are grown up.
I have heard from many people that its confusing to them, because of the time switches, but i don´t think so, because I think you can clearly see the difference in the past/when they were younger it´s more bright colors and a very fresh/happy theme and on the other hand in present/when they are grown up it´s much darker/more mature, so there shouldn't be a big problem. To the overall story: In my opinion its a really beautiful story, if you are getting into it. It has funny scenes, some really sad scenes(I think I cried two times), but also some scenes that gets you kind of angry BUT only when you are really feeling the drama (and I was).

Characters
The male lead is at the beginning a character you are most likely tho love, but when they got older you are going slowly liking him less.
The clothes the female lead is wearing is sooo pretty, she is also very kind to everyone and tries not to bother the other characters with her problems.
I liked the second female lead the most, because she was in my opinion the funniest funny.
The second male lead/boyfriend of the second lead was SOOO nice, he always does some kind things without the other one knowing it and he doesn't mention it.
And the third couple is the most easygoing relationship because the male character is a very easy and kind of childish character and the female character is someone who doesn't talk about her problems (but that is going to be a little problem later).

Music
The music was beautiful, I really liked the song "where the love is". It fits with the drama perfectly!

Acting
They aren't the biggest actors but I think every actor/actress fits their character like it's made for them.


So overall I really liked it and I think its worth  and I also really recommend to watch it.