Why can fortune tellers tell people's secrets?

Facts are stranger than novels. Fortune-telling is also an art, which can be handed down and proved to have certain accuracy, but not everyone believes it, indicating that people in this industry have different levels.

There are rules for calculating eight characters. As long as the time is accurate, most problems can be solved.

There are rules in the eight characters, you can't talk nonsense, you can't ask, you can't tell, that is, secrets can't be leaked casually.