Jiyoung feels an inexplicable emotion when she meets Dokyung on her first day of middle school. After a series of events, she realizes her feelings of love. Jiyoung wants to get closer to Dokyung, her first love. Dokyung has a crush on his friend Sujeong. He wants to be with her all the time, but he can't confess due to their different circumstances, and while he is hesitating, he meets a cute junior. On the day before graduation, Jiyoung learns Dokyung's number and prepares to confess, but she gets rejected. Furthermore, because Dokyung doesn't show up at their meeting place, Jiyoung is bullied at school. Hurt, Jiyoung's personality changes, and she escapes to high school. In college, Jiyoung encounters Dokyung again, and he is simply happy to see her. However, due to the rumors surrounding Jiyoung and her personality, she becomes lonely again. Dokyung tries to take care of her and faces people's prejudices. The end of a tiresome first love, the two begin their love.