Lin Zhi's college roommate, Jiang Yan, a freshman, falsely claims she can buy computers for just 800 yuan each and collects money from their classmates. Faced with peer pressure, Zhou Yu's intimidation, and a teacher's misunderstanding, Lin Zhi stands her ground and preserves chat records and audio recordings as evidence. She publicly reveals the actual prices and purchasing procedures at her mother's store. When the truth comes out, Jiang Yan and Zhou Yu refund the money, apologize, and receive disciplinary penalties. Lin Zhi also uses evidence to dispel rumors and protect her family's rights, teaching her classmates to consume rationally, act honestly and honorably, and take responsibility for their choices.