What did you say when you told the truth?

During the Five Dynasties, Li Decheng, the king of Zhao in the Southern Tang Dynasty, was ordered to guard Jiangxi. A fortune teller claimed that he could see everyone at a glance. The prince of Zhao wanted to see what he could do, so he let several ladies-in-waiting and his wife Teng Guo Jun stand in the yard wearing the same clothes. Let the fortune teller tell them the difference.

The fortune teller came to the yard with confidence, looked around and suddenly shouted, "There is a yellow cloud on the head of the princess." The maids unconsciously looked up at the monarch's head. In this way, the fortune teller immediately pointed out that the one the maids were looking at was the master.