As for the evil qi on Wei Xue's body, when she thought of this, Su Meng secretly laughed in her heart. Her guess was indeed correct. Wei Xue had dripped her blood onto that piece of jade.
That piece of jade was very evil. When she handed it over to Wei Xue, she had already used a talisman to seal the jade. Only human blood could undo it.
At that time, she had already warned Wei Xue not to drip her blood onto it. Although her warning was not very obvious, she had indeed done so. Hence, she had a clear conscience.
Moreover, Wei Xue had promised her at that time that she would not have any other thoughts. It was because she did not keep her promise first. In that case, she had brought it upon herself to be invaded by the evil qi of the jade. She could not blame anyone else.