Zhang Ying and Lu Mei grew up together as childhood friends, having no romantic feelings for each other. Both of them aspired to become teachers when they grew up. As time passed, Lu Mei fulfilled her dream of becoming a teacher, while Zhang Ying fell into a life of delinquency. However, their relationship remained strong. Lu Mei was assigned to teach the most unruly class in the school, Class F4, and sometimes even asked Zhang Ying to substitute for her. Zhang Ying used his personal experiences to educate the students, hoping they would gain knowledge from a young age, especially wishing for them to benefit in character and attitudes in life, and to avoid going down the wrong path. Soon, under the guidance and education of Lu Mei and Zhang Ying, the students worked hard and achieved excellent results in their high school entrance exams, which deeply moved both Lu Mei and Zhang Ying. But just when many students began to study seriously and become friends with the two teachers, unexpected news arrived about budget cuts and a reduction in students...
