Adopted daughter Sunan Zhi was falsely accused of patricide and was exiled to the border for three years by the legitimate son of the Duke of Zhenguo, Su Jingchuan, enduring endless torture. She endured humiliation and practiced closed meditation to suppress the fierce beast Zhu Jiuyin, but was falsely accused of suppressing the auspicious dragon due to Su Yunyun's collusion with the Grand Prince and the national teacher's conspiracy. With the help of Crown Prince Xiao Heng'an, Su Nanzhi cleared his name, exposed the truth of Su Yunyun's patricide, successfully refined a ferocious beast, and was honored as the Holy Maiden of the Great Xia Protectorate, ending family grievances and safeguarding peace in the world.