She is Zhao Yue, the concubine of the Roufu Emperor in the history books. She went from being a sacrifice for marriage in Beishou to becoming the uncrowned king in charge of the north.
He was Yin Mozheng, the commander of the Zhongyi Army, who captured her in the sea of blood on the Corpse Mountain and taught her strategy and iron-bloodedness.
He devoted everything he had to setting up a world-class chess game, not to send her to the throne, but to give her back the freedom to never play chess.
When the poisonous arrows of conspiracy were shot, he used his body as a shield and said those profound farewell words to her:
"Yue'er, the history books should be written carefully that you are in the north and have the country in your hands. But above that painting, a blind person can no longer be ranked with you."
Intention: The most extreme love is not possession but achievement. To make you the person you were meant to be, even at my expense. We are each other's blade and shield, cutting through the darkness together and bathing in the dawn together.