At a calm day in spring, Yeon-ah makes her classmates embarrassed by suddenly saying that she smells some odor at her body. Sung-eun, class monitor, who used to care only about her own study, becomes very interested in Yeon-ah's phenomena. Yeon-ah gets more serious day by day and she finally stops eating at school. At lunch time one day, Min-young and other classmates laugh at Yeon-ah and force her eat lunch. Sung-eun gets angry with those classmates and fights with Min-young. After that day, Yeon-ah stops attending school and Sung-eun becomes isolated from her classmates. On Yeon-ah's birthday, Sung-eun intends to visit her. On the way to Yeon-ah's house, Sung-eun gets surprised to find that she is going home hurriedly eating something in the street...
