first of all i watched this drama mainly for Gong yoo & Gong hyo cause they are my favorite actors
& i'm fond of noona romance
gong yoo was amazing in this drama i fall for him really
the story is nice & mainly talking about the students problems
but that doesn't mean it didn't has many weak points
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i think this is SPOILER
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first of them the character of kim da is very weak & provoking so much he couldn't even fight for his love or solve the problems or made her feel secure with him he lets gong hyo been humiliated without moving a toe
he wants every thing prepared for him without fighting & i think he didn't love her truly or else he was going to move mountains for her
true love appears in a very small actions like what gong yoo did for her
& if he was capable to solve the problems that easy y didn't he made that step sooner
at the beginning of the drama i wished they continue together & after every ep i hated him more
he didn't even has enough courage to tell her from the beginning he loved her but he took gong yoo as an excuse to bring her closer even when he knew she loved him he didn't make the right actions towards the problems
and he is really selfish he didn't even bothered himself asking her if the plan he made suits her or not he didn't also care about her dream he assumed that his dream will be hers automatically
the main weak point for me was his character

second : how could oh yoon possessed the school while she was only the manager
that doesn't make any sense for me or may be i missed something

third : since when selfish & hurting was counting as true love
i hated the character of choi yeo & oh yoon so .. both were B*****

fourth : i felt that gong hyo suddenly fall for gong yoo the writer made her fall for him too late at ep. 14

fifth: the events of the drama doesn't make sense to me i don't know y but i didn't feel comfort & the end was weird although it's happy but doesn't explain much it was concise for me comparing to much detailed ep.
may be the sub was bad that's y i didn't get much

in total i loved the story but hated that weak points in it