Huai An marries into the Tu family as a matrilocal son-in-law, responsible for auditing demolition accounts. Facing pressure from clan relatives who inflate areas and embezzle old funds, he adheres to his professional bottom line and refuses to keep fake books. With the secret assistance of his wife Tu Qingtang, Huai An gradually uncovers the truth behind the embezzlement of family heritage from 1993 through archiving and interviewing witnesses. Ultimately, he uses legal means to stop the patriarch's illegal detention of his wife, and vows to clear up the dark secrets of the council's funds.