this is just a personal opinion, many might disagree, some might agree :)

to me, this is a well-written piece. it's a story about one's first love, friendship and growth.
i liked the story-telling and how it focuses on the characters development vs just another drama.
this is one of those rare gems.

i enjoyed the fact that it's like a trip to memory lane - taking some of us back to our younger days, being foolish and reckless (being our true self)
it brought back those feelings of having crush on our seniors, can't tell what is really love (vs like, we're only 18! 19?)
how we grew from failure and hardships
how we then learned about liking someone, what it really means falling in love with someone
then breaking up with someone, that we really like (love)

however i do admit, this is so rare that one really have to start and keep going until the end without a break.
how most of us stayed and waited, that actually breaks the momentum in my opinion. (will rewatch this during the summer!)

and for those who got crushed by the ending, whether or not it delivered the answer you were expecting, try to think of it as you are now going through the "breakup" - the agony you were feeling when watching the last few episodes? (korean saying) It's okay, cry and rant all about it. and once you're over it, you'll then remember the sweetness it brought you :)

and one last thing to add, Kim Tae-Ri. my god, she's really Good.