When Princess Jiangdu first met Wei Bai, Wei Bai was an obscure nobleman's retainer, a nobody of no consequence. Princess Jiangdu was merely curious that this retainer was a big sister, and that the big sister had volunteered to become her tutor.
Wei Bai treated her well. Whatever she wanted, Wei Bai made sure she got it, including power and Wei Bai herself. When she grew up, she realized that Wei Bai would always choose power over her, and she would do the same.
But she didn't think there was anything wrong with that. Couldn't she have both power and Wei Bai?
Years later, Wei Bai said, "No. You want to become an emperor with real power. I only want to end the imperial system."
Princess Jiangdu asked, "Then why did you let me have my way all these years?"
Wei Bai replied, "From the first time I saw you, I knew you would make an excellent chess piece. I decided to use you, but I still felt a little guilty."
Content warning 1: If you're looking for pure romance, don't click in. Both of them are utterly devoted to their own goals. Wei Bai is determined to drive industrial revolution and bring down the imperial system, while the princess is determined to become an emperor with real power. In the early stages, Wei Bai controls and uses Princess Jiangdu. Later, the two clash fiercely, always choosing power over each other without hesitation. Their affection is false, and there is some genuine feeling, but not much.
Content warning 2: The two female leads will try to kill each other. Whether Wei Bai kills the princess or the princess kills Wei Bai in the end is still undecided.
Content warning 3: Both of them will marry two or three times, and each will have two or three children. These are purely political marriages. After Wei Bai has wrung all the usefulness out of her husbands, the princess will kill them. The princess's husbands will also be killed once they are no longer useful. Though the husbands change like revolving lanterns, their lover never does: each other. Yes, they cheat on their spouses, but the princess sees nothing wrong with that: the unloved one is the mistress. Their various spouses all know about the relationship between the two, but there's nothing they can do about the princess except watch her move in openly.
Theme: Ideals above all.