In a modern high school, He Zhichuan takes over as the homeroom teacher of Class 17 in the second year, only to discover that the notorious troublemaker He Ran is actually his own younger brother. Committed to fairness and education, he leads the entire class in uncovering the truth behind false accusations, resolving injustices on the basketball court, and putting doubts about their academic performance to rest. He guides his students to acknowledge their mistakes, support one another, and improve together. From ranking at the bottom of the grade, the class steadily rises, as everyone embarks on a grounded and positive journey of growth.