Oh Ha Ni is a girl who lacks in academics and always has her heads in the clouds, gives a letter to the school genius Baek Seung Jo, confessing her feelings. He publicly humiliates her by giving back her love letter edited, and states he hates dumb girls. He bets if she can get into the top 50 for test scorers he will give her a piggyback. Fate would have it, Ha Ni's house collapses and they move into her father's friends house which so happens to be Seung Jo.