Lost his mind

The Empress could be seen in her resting room on a chaise. Wei Zhang Yong was standing a meter away from the Empress with a bowed head. "Why did you not kill that maidservant? And, how could you not see what the Crown Princess was planning? Did you see how Sheng Li was glaring at me? He has the same eyes as his mother!" Empress Wei was furious as she threw the cup in her hand, which broke into pieces. 

"Your majesty, forgive me. I did not have any idea that the Crown Princess has a friend who knows the antidote," Wei Zhang Yong asserted.