"Sir, I finally learned this lesson." - She used her country to teach him the only gentleness.
She is the daughter of the Grand Tutor. She entered the palace at the age of three to study with the Prince and stayed with him for twenty years. She taught him benevolence and righteousness, and after he ascended the throne, he fought for years, killed his younger brothers, and slaughtered his old ministers. She finally realized that she had taught a tyrant and resigned. Ten years later, the enemy's troops came to the city, and she was the enemy's military advisor. He stood on the city wall, suddenly smiled, and ordered the city gate to be opened wide: "Sir, I finally learned this lesson." - She taught him the only gentleness with her country.