Retired senior accountant Zhou Guilan discovers that her pension account is missing one yuan every day. Her daughter says it is only one yuan. But Zhou Guilan, who has worked in finance for thirty years, knows that if accounts do not balance, there must be a ghost. Following the one-yuan deduction records, she uncovers a withholding agreement personally signed by her daughter on her behalf, exposing a scam ring targeting elderly people living alone under the shell of 'Peaceful Homeland'. Neighbor Grandma Zhao has already been cheated of thirty thousand, and more elderly people are being hunted. Using an old account book, a red pen, and thirty years of auditing skills, Zhou Guilan tracks the amount from one yuan to eight hundred sixty thousand, from the community to the mastermind boss, and also roots out the fear behind her daughter's words, 'I am doing this for your own good'.