After reaching the Twelfth Realm, she discovered that to break into the Upper Three Grades, she needed to achieve Integration.
During the process of Integration, she attempted to merge the Dao and Buddhism.
Just a moment before her success.
The long-dormant Demon Barrier erupted.
The Heart Demon, which had not manifested in a long time, returned in a terrifying form, forcing her to relive the shadows of her childhood. This time, it was even more severe, to the point of creating a Heart Demon's reflection.
A Heart Demon's reflection meant the Heart Demon could now conjure illusions to influence its host in the physical world.
For example, people long dead might reappear before your very eyes.
The things you fear most would manifest at crucial moments, constantly affecting you.
Once you see it, you can't just pretend it isn't there; you will inevitably be affected.
This is what the world would call demonic possession.
In fact, Sui Yuqing had been possessed for a long time.
