Park Chan Yeol was a perfect child. Despite his clumsiness and occasional lack of tact, he got the best grades, was one of the star players of the basketball team, was friends with all the boys, and was swooned over by all of the girls. However, he wasn't really very extraordinary. He simply did things right, with good intentions and hard work, and he got results. A model human being. 

Kang Mi Na, on the other hand, was his total opposite. Despite being praised as a genius, constantly scouted- not only by universities and institutions, but by entertainment companies and agencies for her good looks-, and idolized by most everyone in their school, she did nothing but eat, sleep, and play all day, every day. She was an image of the mortal sin of sloth. A few others, as well...

They didn't really interact- at all- even though they'd been in the same middle school and were now in the same high school. They just quietly acknowledged each other's existence until they were placed together as representatives of their school in a contest of national scale. In the words of Chan Yeol's best friend, Do Kyung Soo, there was no escaping it now.