The study of "Xuan" is actually not mysterious.

Why
The lives of ordinary people may be calculated.
Because that is the factory setting for a lifetime.
Never leveled up

Why
Some people's fate cannot be predicted.
It might also be the awake person.
A person with wisdom and insight
Consciousness upgraded person
People who break through the understanding of their original family.
People who constantly break the boundaries of old cognition
His consciousness parameters have been modified.
And the only person who can make changes is oneself.

"Xuan" is actually not mysterious.