Compared to Kayako and Sadako, the Slit-Mouthed Woman didn't kill the most people, but she encountered the most professions and understood human nature better.
And Kayako?
Housewife.
And Sadako?
Young girl.
Moreover, because they only retained their resentment in the past, without reason, they did not have the insight that the Slit-Mouthed Woman had after regaining consciousness; they just felt they had made a huge mistake.
Therefore, the control of this body was in the hands of the Slit-Mouthed Woman.
"That's true, but now, you have to face the thousands of resentful spirits inside you." Sun Wukong took out a book of the "Heart Sutra" and handed it over.
"Indeed, it's time for us to face them." The Slit-Mouthed Woman accepted the "Heart Sutra", "What's this?"