Among scholar dramas this is one of the best, most consistent and realest, even if Seong Wu still needs to practice his acting overall it was "good".
I don't like this types of drama because they get boring easily, full of childish situations and always the same type of characters, even if this isn't the exception it was more "mature" and focused in relationship and grades.
[spoiler] What I really like is that JTBC puts a (maybe) gay character (The second this year) and even if he don't have as much screentime as I would like is rare to see it in a korean drama; and Kang Ki Young character, he nailed his performance as Oh Han Kyeol, also Kim Sun Young she's wonderful in every drama.
What I didn't like was the main couple, I don't feel too much chemistry between them and they get A HUGE AMMOUNT of screentime wich I considered unnecesarily (I don't know why but Seong Wu made long pauses when he speaks), also the way they ended Whi Young story was absurd, in the last episode 80% of the episode was used to show Joonwoo and Soobin's life but don't even show any other character so the script was a fail to me. [/spoiler]

If you like the main couple then you should watch it, if you don't then don't waste your time in this.

My score: 7.8/10