There’s always that one subject that every student really hate and for LuHan it is his calculus class, he hates it no scratch that HE LOATHES the subject so much he is about to drop it during the first day of class. However everything changed when a handsome man in suits walks inside the lecture hall and introduce himself as Professor Oh Sehun. Now Luhan’s has bigger problem than solving calculus equations but the question is how can he solve it?