Lin Xiaoyue, a modern woman with expert accounting skills, accidentally travels back in time to 1983 and becomes an orphan in a crowded residential compound, where she is relentlessly exploited by her relatives. Her second aunt's family covets her job and compensation money, forging fake receipts to frame her for pocketing money from a wedding banquet and attempting to take away her only means of survival. Armed with her solid accounting expertise, Lin Xiaoyue uses her redwood abacus to unravel the layers of deception, gathering physical evidence and witnesses before exposing the forged documents in front of everyone. Despite being bullied and suppressed, she refuses to back down. Determined to uncover the truth, she seeks to clear her father's generation of the false accusations that have tarnished their reputation. After weathering countless storms, Lin Xiaoyue breaks free from her shackles and establishes herself through her own abilities, beginning a brand-new life in the 1980s.