In this scene, Cai Mingyu tries to save his sister from the assassins who are trying to kill her. He tells her that she is single-handedly holding off the assassins and that he is ashamed of facing her. If he can't meet her father, he says, he's ashamed of himself. He says that since he stands in his way of saving his sister, he has no choice except to kill all the assassins. Inside the morning glories hall, emperor Yu sheng, his majesty, please taste the grape ! The ninth prince begs outside the palace for an audience ! He whispers to his father that he doesn't remember having a son like the ninth prince . He also says that if he has to be a "stab-killer" for protecting his sister , he would kill anyone who tries to stop him . Even the emperor himself will have to decide whether or not to kill a trespasser on sight. He adds that even if it is an emperor himself, the emperor's life and death are up to him to decide