Han'er had learned the magic of the Red Lotus Demon and had thus formed a bond with this old Demon, subtly influenced by him in her mind.
At that time, the Saintess alone could barely hold her own against the Red Lotus Demon. Especially since he couldn't defeat the Saintess, he released Demon Light and Demon Fire as he left, setting up a Demon Formation to trap them and left many demons to harass them day and night.
The old Demon deeply knew the Saintess's weakness, allowing the demons to specifically conjure images of Poison Hand Mo Shen and the enchanting corpse Cui Ying rewarding each other on her bed Cave, complete with not just images but also sounds, continuously pouring into her ears, brain, and heart.
The Saintess focused intensely on countering the magic day and night, failing to notice that the person behind her had gradually become demonized.
