Why didn't Mu save Yin Rong?

Because the director won't let me, this is the need of the plot, from the TV series "Mu Jiyun at Sea".

Adapted from the novel of the same name, the play tells the story of the struggle for the world among the descendants of eight tribes, namely Mu, Mu Ruhan River and Ye of Hanzhou in son of the general.

abstract

On the land of Kyushu, a fortune-telling monk fled to Hanzhou. When he was dying, he was saved by Ye, the 13-year-old son of Shuofeng and the master of Shuofeng Department. Despite the opposition of his mother, Longge Danzhu, Shuofeng and Ye decided to keep the fortune teller as their slaves, hoping to hear more stories about the land of the East from him. After years of imagination, the snow in June made the north wind department suffer from hunger.

Shuofengda decided to kill the sheep that used to be a tribute. At the same time, the fortune-teller told Mu Yun's royal secret to Master Feng's father and son-six emperors, Mu, more than one person. Just as he was about to tell the secret in the general's office, Mu Ru followed suit, arrested the fortune-teller and confiscated the property of Master Feng's department on charges of harboring fugitives.