The Bossy, Money-Loving Commandery Princess Marries the Heir as His Second Wife

[A quick note: The heroine becomes emperor + a powerful golden finger + both leads have children, and she is the younger sister of his late wife + the hero must suffer to win his wife back] Everyone knows that Princess Zhaohua loves money. Now of marriageable age and unwilling to marry a prince, Princess Zhaohua sets her sights on a wealthy merchant. She doesn't care about his status, as long as he gives her a bride price in cold, hard cash. All that's left is to make the engagement official, but then something goes wrong. Yun Xian, heir to the Duke of Xiang, has lost his wife and is being pursued by Princess Anqing. Unwilling to get caught up in the struggle for the throne, he sets his sights on Princess Zhaohua, his late wife's younger sister. She can serve as a shield, and she isn't afraid of Princess Anqing. With a little scheming, the wealthy merchant breaks off the engagement, and rumors about Yun Xian and the princess spread throughout the capital. Yun Xian then calls on her in person to negotiate terms and bring about their marriage. Those who scheme against others eventually get a taste of their own medicine. Princess Zhaohua is pregnant when she and Yun Xian marry. Yun Xian thinks the rumors about her are false, only to discover that they're true. But an imperial decree arrives, and neither of them has any choice but to wed. Though they can't stand each other, a special drug eventually brings them together. As they trade barbs and schemes, Yun Xian begins to fall for her and hopes they can build a life together. Then his wife coldly leaves him, ascends the throne, and says their fate has run its course. All their love and hatred leave him alone. No, Yun Xian realizes he can't live without her. He gives up his title and official post, willing only to enter the palace and become her new favorite, hoping she will change her mind…