Yeonjun can't stand his classmate Beomgyu. He is irritated by absolutely everything about Beomgyu: he is loud, annoying, talks too much and has too much energy. Every time Yeonjun sees Beomgyu, he either picks on him or tries to avoid him because he gets tired of his loud and annoying personality.

One day on a school trip, Yeonjun became very sick, he couldn't stop coughing and his eyes were watery due to his illness. The teacher then sent Beomgyu to take care of Yeonjun.