Jiu is assigned to kill Song's eldest son, but he does not immediately realize that son is Tian.  Dr. Qi makes a revelation about the mysterious mushrooms growing at the Song household. 

Emotions are on the rise at the Song household as Madam Li remains under suspicion of murdering Dong with the beetle orchid, Yang is accused of trying to steal Pin from Tian, and Yang begins to suspect that Jiu cannot be trusted either.