What is good on the left and evil on the right?

Half is good and half is evil.

In traditional literature, yin and yang faces refer to two people with completely different attitudes, which are derogatory and often used to satirize people who are afraid of bullying. In photography, the left and right parts of a face show different light, which is the yin-yang face. In real life, the colors on both sides of cheeks are different, which is also called yin-yang face.