Have you ever heard of the Yin Man? I'm not talking about ghosts, nor are I talking about those people who can channel spirits and invite ancestors to come to their bodies. The requirements for being called a Yin person are quite stringent, and it doesn't just mean you think you are Yin.
1. You have to be born on a yin day, a yin month, a yin time, and a yin part in a yin year. Of course, you have to give birth naturally;
2. Born by a person who is extremely yin and is born in the yin part of the yin year, yin month, yin day, yin hour;
3. And only a woman who has been delivered by a person of the highest yin can be called a true yin person.
Look, I don't know which one defined this. It's really harder than being a refugee!