To treat her daughter's illness, single mother Lin Wan silently endures long-term bullying and shifting of blame by her colleague Wang Mei at the company. Wang Mei inflates procurement costs, frames Lin Wan, and even causes her to face wrongful dismissal. Lin Wan does not surrender; she unites with partners such as intern Su Xiao and technician A Ze, fighting back with twelve work ledger books accumulated over three years and electronic evidence. With everyone's help, they expose the insider dealings between Wang Mei and the company's vice president, ultimately leading Wang Mei to turn herself in voluntarily. Lin Wan not only clears her grievances but is also promoted to Administrative Department Manager. She pushes the company to establish an Employee Rights Committee, implementing a flexible work system to let the workplace return to fairness and warmth.