Class 172 is a key class for their excellent students of an ordinary secondary school in Hunan province, from which the kids’ main goal is to upgrade into one of the best province-level high school – No.1 high school of the county. In the recent few years, the school’s enrollment rate to high school was not quite satisfying, and this year, the newly promoted class in charge teacher – Mr. Xiang, who’s only graduated a few years ago, became their brightest hope to teach the students and raise the enrollment rate for school.