It's been a while since my last time watching school drama in recent years but I have to admit that this is so far the best school drama of this year. The main theme and motif is familiar but the way they close or solve problems is ethical and thoughtful. The main casts are still newbies on acting but their expression and acting is good enough to make the film successful. Another main point is the OST. It's not necessary to make numerous tracks but to make the ones that last in the audiences' mind. Nowadays, I can see the trend of english OST in some of JTBC's film. And it doesn't disappointed me. I think it's a new and modern approach for K-drama. Must enjoy this film and recommend it to everybody.