The allusion of Bai Yueguang and Zhu Shazhi comes from Zhang Ailing's novella Red Rose and White Rose. The novel describes the story of a man falling in love with two women at the same time, one is his wife and the other is his lover. He compared the two women to Bai Yueguang and Zhu Shazhi.

Bai Yueguang refers to the perfect woman in her heart, as pure as moonlight and unforgettable. The man compared his wife to Bai Yueguang, expressing his admiration and love for her.

On the other hand, Zhu Shazhi refers to the imprint left in my heart, representing an unforgettable love experience. In this story, the man compared his lover to Zhu Shazhi, expressing his deep feelings for her and his emotional entanglements.

This allusion was later widely used in the description of love stories to describe people's pursuit and yearning for perfect love and emotional experience that they can't give up.