Jessica was the leader in her class. As a leader, she got a duty to find out about Kim Jaejoong. A student who always doesn't follow the lessons and rarely go to school.

Jessica should always follow Jaejoong, and sometimes have come home to Jaejoong's home to force him go to school. Jaejoong even made Jessica crying.

And Donghae always follow Jessica. Kept asking when her duty will finish.

Can Jessica change Jaejoong being a good student?