The rating of this drama will probably depends of the nationality and age of the viewer and not the plot itself.

This drama was funny, exciting and got emotional a lot deeper in the story line, but it was well plotted, realistic when it comes to how studying works (not like other dramas where the not so bright child suddenly becomes an ace) and regarding love. You won't know who to ship with Harumi.
Firstly I was like "NO, this isn't right" with where the plot was heading, but understanding another ones feeling, well that is indeed something totally else.
Phrases I loved from this drama:
"Isn't love enough?"
"the brain doesn't understand the meaning of the word 'NO'
and "I'm old enough to make my own choices"