South country and north country, two people are in love.
Not wanting to be forced to marry into an enemy country, she transformed into a man and went to the enemy country as a hostage. She used her kind, gentle and respectful wisdom and the eternal music of the piano to mediate between the palaces of the government and the public, and between the streets and Kuaiji.
The gentle confidant of Qinyin, the prince of Qiu Kai's enemy country, and the mysterious jade-faced handsome man. They are national mourning, hatred, love, promise, and desolation. Who is the husband she prays for?