The good-for-nothing Wang Qiang has no job. One day, when he goes out to play cards, he leaves his elderly mother Zhang Cuixia locked inside the car. When a passerby, Zhao Wei, sees this, he quickly calls Wang Qiang. Wang Qiang asks Li Lu to open the door. Although Li Lu clearly sees that mother-in-law Zhang Cuixia is right inside the car, fearing that her illicit affair will be exposed, she dares not open the car door and instead insists on framing Zhao Wei as a thief...