Four-year-old An'an gets caught in a rolling shutter door. Her grandmother, Zhao Xilian, had originally said she would only go out to play mahjong for ten minutes, but in the blink of an eye, her decision leads to a terrible disaster. Overcome with remorse, Zhao Xilian vows never to touch mahjong again. However, her son, Zhou Lei, falls into a gambling trap and racks up a debt of 200,000 yuan. The creditors use An'an to threaten the family, while his wife, Shen Yue, becomes heartbroken and asks for a divorce. Just when the family seems on the verge of falling apart, Zhao Xilian sits down at the mahjong table once more. Her family accuses her of never learning her lesson, but no one knows that she has secretly hidden a recording device, determined to expose the gang's scam at the mahjong table.