When the concubines slept, there were special palace maids to check their bodies to prevent poisoning. However, if some things were hidden too deep and could not enter, no matter how good the methods were, it would be useless!
Moreover, since he dared to do this, the poison was not an ordinary poison. It was not an acute poison either. It was chronic and very slow. It would only be possible to succeed if it condensed bit by bit and accumulated.
Zhang Ronghua realized that if the imperial palace wanted to harm Emperor Xia, they could only poison him. According to the rules of the palace, only that place had to be hidden in the deepest part of the palace. There were so many concubines in the palace, so it was impossible for the Emperor to only sleep in the Tranquil Heart Palace. He deduced that there were other people involved in this matter.
It would be fine if it was unintentional, but if they came to an agreement in advance, then, then the consequences…