She was a princess of the previous dynasty, who studied medicine incognito to help the world, and was burdened with a blood feud; he was the new iron-blooded emperor, who killed his brother to seize the throne, but she stabbed him in the center with a golden needle. He said: "I will give you half of the country, and I will help you avenge it." But she said: "I don't want the country, I want this world - no more innocent souls."