Why does the two-time favorite princess have dual personality? How is the plot explained?

1. The heroine Qu Taner is the daughter of Shangshu Mansion, and has a "dual personality". There are two different consciousnesses living in one body, one is a delicate, cautious and lovable lady, and the other is a lively, cheerful, brave and direct "female man". The dual personality is changed at will, and the butterfly effect is triggered in a small range, and the people and things around her all change accordingly.

2. Wearing a brocade and white gown, wrapped in an impeccable posture like a cypress and a pine tree, rocking a folding fan and strolling leisurely, like misty white clouds on a green hill and faint running water in the night ... clear but deep eyes, a tall and handsome nose, a perfect curve and a thin lip, the ultimate beauty, and the indescribable elegance just now, he is the ten thousand people of Dongyue country.

3. There is an engagement between the heroine Qu Taner and Mo Liancheng, the eighth prince of Dongyue country, and the emperor gave the marriage, so their marriage is bound to be held. It's just that the two people with ulterior motives started various contests after they got married, and they gradually attracted each other and became a pair of tell it to the judge.