What does the fortune teller mean by yin-yang face? _ What is the yin-yang face the fortune teller said?

What did the ancients mean by yin-yang face?

Metaphorically, a person has two completely different attitudes. Lu Xun's Tales of Three Leisure Stories in the Literary World: "Therefore, it is not only false to laugh and cry, but also different from left to right. Even the "yin and yang faces" copied by Ye Lingfeng are not enough to describe themselves vividly. I think this is a pity and I feel quite lonely. "