Zhou Honglin, a 48-year-old cashier and full-time maid at her husband's hardware store, endures constant abuse from her mother-in-law and neglect from her husband. After a rainy day impulse purchase yields a five-million lottery win, she stumbles upon her husband's affair with a store clerk, aided by her mother-in-law. Realizing years of exploitation, she resolves to turn the tables and execute a calculated revenge.