Nirvana in Fire Episode 31

The Xuan Jing Bureau ambush and capture Wei Zheng. Prince Yu asks the Empress to inspect Consort Jing's medicine cabinet and say that one of her herbs can be poisonous to the Emperor. The plan is set in motion, causing Consort Jing to be interrogated as well as have her servants locked up. However, Prince Yu lets out a servant named Xiao Xin so she may try to send a message to the emperor for help. However, during the journey, a man claiming to have been sent by Mei Changsu appears, subdues the general who accompanied her, and sends her back into the palace. Later, Wei Zheng's companions race to the Su Residence to tell the chief that their friend had been captured. Meanwhile, Tong Lu is captured by Banruo, who finds out that it is Miao Yin Court and Sir Shisan who uprooted her informants. (Source: Wikipedia)