Prince Qi does not believe that Xi Wen committed suicide because he’s committed a crime. When he finds the medallion in Xi Wen’s hand, he understands the message Xi Wen wanted to deliver – someone is trying to harm Prince Qi. Su Ci begins to investigate the case of Tian Yong. She finds that some powder in the warehouse Tian Yong was at. The powder poisons insects. After checking, the powder is the deadly Udumbara poison. (Source: Viu)