Xiuyi approaches Xue Beiji for a reason. On the surface, she is Shen Yixiu's replacement, and she gets close to Xue Beiji to complete the mission Ji Yifeng assigned her. But she has her own agenda.
Sleep with Xue Beiji, marry Xue Beiji, or, at the very least, use him to get away from Ji Yifeng.
What she doesn't know is that Xue Beiji has known who she is from the very beginning.
Only when someone who looks exactly like her appears at the wedding does she belatedly realize that she has already fallen into a vast, bewildering scheme.
She thought it was a trap designed to draw her in. Only in the end does she understand that it was a singular love, willing to risk everything to break free.