Weaken the power of the queen mother. The pipa essence in the TV series Love in Ruyi Palace is Mei's concubine, a pawn placed by Empress Dowager Cixi and a part of Empress Dowager Cixi's power. In order to weaken the influence of Empress Dowager Cixi, Emperor Qianlong decided to remove this piece of good and evil. So the emperor killed two birds with one stone by adding a medicine that harmed the mother to Mei's medicine.