Thirty-six-year-old Dang Meiyan is a saleswoman at the Ping Shan Mall, selling mirrors. She and her husband, Lu Zhiping, an art teacher at the Ping Shan Normal University, both grew up in an orphanage. She is three years older than Lu Zhiping, so her love for her husband is like that of a wife, a sister, even a mother. In short, Lu Zhiping and their son Lu Xiaojun are Dang Meiyan's life, her all, everything. Therefore, when the news that Lu Zhiping had become the youngest associate professor in the art department was not yet announced at the university, everyone in the entire Ping Shan Mall already knew. At the Ping Shan Normal University, in Lu Zhiping's studio, the human model he had finally managed to invite backed out at the last minute. Lu Zhiping and his two graduate students - Mei Yugé and Yang Gang - were all feeling frustrated. He sent the two students home first, smoked a cigarette, packed up his painting tools, and was about to lock the door when Mei Yugé came back. Hesitating, she asked her mentor for a cigarette, took a few strong puffs, blushed, and said, I know what you have in mind for this piece, maybe I am the most suitable model, of course, I can only let you paint me alone, and it must be kept confidential... As Lu Zhiping hesitated, Mei Yugé had already pulled the curtain - the sound of taking off clothes could be heard from inside... Lu Zhiping said, Yugé, wait a moment, have you thought it through? Mei Yugé said, Yes, I have... Teacher, let's get started! Lu Zhiping said, Wait a moment, let me think it over...