Forty-year-old divorcee Zhou Mingyan opens her eyes to find herself transmigrated into the despised 'evil stepmother' of a marquis's household. Her mother-in-law forces her to serve tea to her husband's mistress, her husband uses her dowry to support his beloved, and her three stepchildren hate her to the core. Everyone expects her to bow her head, but instead, she picks up the tea and drinks it herself. 'I paid for it with my own money. Why should I give it to the mistress?' From auditing accounts and collecting debts to putting the marquis's household in order, exposing her scoundrel husband, and protecting the children, she uses modern thinking to deal with every parasite in the family. But when the account books uncover a major military provisions scandal and the truth behind the first wife's death, she discovers that beneath the household power struggles lies a sinister web of powerful elites determined to silence her permanently.