She reasoned that since the king had already called Auntie Lan to take care of the little prince in the hospital, he might also bring her back to the palace later.
If Auntie Lan got reappointed, would she be replaced again?
No way!
Absolutely no way!
She would never let it happen!
Therefore, she had to do something before Auntie Lan came back. Most ideally, she should plan out an affair with the king.
That being decided, Yao Zheng managed to get the kind of drug she needed. She was planning to put it into the king's meal. When he was drugged, she would sneak in and make use of her chance.
Yao Zheng was not completely stupid. She could not drug the king herself. Otherwise she would be sentenced if it was uncovered.
She had to find someone else to do it.
In order to carry out her plan, Yao Zheng prepared well and found a scapegoat, so that it would never be blamed on her.