The story takes place in a city in the north. The Zheng family has two daughters, the eldest and the second. Sister Zheng Hao has had heart problems since she was a child. Her parents doted on her, and her sister Zheng Xiu gave her three points everywhere, so she developed a willful and overbearing character. The college entrance examination is coming and the two sisters are in the same examination room. Zheng Xiu was kicked out of the examination room because she gave her sister a note. Zheng Hao was admitted to the university, so Zheng Xiu had to take her mother's class and work as a cashier in a material company of the District Materials Bureau. ...