The doctor tells Biyuan cheng that if he is not treated promptly, his life may be at risk. He tells him that he should continue taking the jiuzhuan and yulu pills to clear the traces of the poison from his body. The doctor also tells him about the strange poison that he fed to animals. He says that the symptoms are similar to the symptoms of the "strange poison" of "the mystic grass" from the west. The only person who is in contact with the "western regions" is the grand preceptor, who is a powerful official in the court. The scent of "golden sweet clover" is faint, but it would not be possible for a regular person to detect it. The prince is wiser than most, the doctor tells him, and he has the responsibility to protect his life.