A lot of times people have slowly forgotten the purpose of learning like how we used to be. Education had somehow become a tool or an instrument just for the sake of competing for qualifications, to use it as a weapon to threaten others, or it's just another money game to further widen the class difference between rich and poor, as what has been depicted in the movie. In fact, learning should be an excitement of discovering something with the intention of interest in it, instead of just using it to survive, but sadly there's only so few people that do so. In this case, the movie tried to achieve a pure heart for learning mathematics with the chemistry between Choi Minsik and Kim Donghwi that is so impeccable because no matter if we're old or young, learning should be a fun thing as how it always should be from the beginning.