In 1989, at Hongxing Middle School in a Northeast county town, young teacher Lin Xiao woke up to time-travel back to the late eighties, becoming the head teacher and math teacher of Grade 3, Class (4), which ranked dead last in the entire school. Facing a rebellious class prone to skipping classes, fighting, and playing pranks, he used down-to-earth, unconventional teaching methods to tailor instruction to each student, making a bet with the students to raise their scores by fifty points in thirty days. Along the way, he withstood the suppression from dean Zhao Defa and others, leading the students from last place to first place in the entire county. Ultimately, all forty-two students passed the cut-off lines, twenty-eight entered undergraduate programs, and Zhou Xiaohe became the top scorer with a perfect score in math; Lin Xiao also found love with English teacher Su Wanqing. The story is passionate and inspirational, filled with laughter and tears.