Jun-hee has a secret crush on Dong-kyun. One day, while Dong-kyun is sleeping in the school nurse’s office, Jun-hee kisses him, and Soon-young catches him in action. Promising Jun-hee never to tell a soul about what she saw, Soon-young orders Jun-hee around for her errands. During the summer break, Jun-hee gives Soon-young a ride home from her part-time job after he gets done at the learning center. As Jun-hee and Soon-young spend more time together, Soon-young asks Jun-hee things about Dong-kyun. Soon-young learns Dong-kyun’s birthday is coming up and asks Jun-hee not to hang out with Dong-kyun, but Jun-hee ignores her. On Dong-kyun’s birthday, Soon-young catches Jun-hee and Dong-kyun hanging out together.
