One is a singer whose life experience is unknown but believes that she is the missing princess.
One is a scholar who is extremely smart but cannot stick to his heart when faced with a choice.
They first met in a conspiracy. She betrayed the young man who fell in love with her, and he betrayed the teacher who cultivated her.
One of them gained freedom, the other gained power, and they both saw the ugliness of the other. They should have nothing to do with each other in this life.
However, when foreigners invaded and the world was in chaos, history pushed them to the forefront.
Purpose: Choice in troubled times