After an accident, Shen Tang caught a glimpse of her cruel fate as a "medicinal catalyst" before it was meant to unfold. She realized that her spiritual root and her entire life had been part of a calculated scheme from beginning to end.
So she played along. Outwardly obedient, she secretly seized the chance when Luo Wuya asked her to offer her essence and blood to save Su Qingwan, switching the life-saving pill for a Heart-Devouring Gu. With that, she struck her first blow against fate and successfully escaped the sect.