An old story. The logic wasn't thought through carefully, so read with caution.
This story is set in a fictional dynasty resembling the Ming Dynasty.
Zhang Yinzhi is the only daughter of the Zhang family. For the sake of her family's interests, she temporarily disguises herself as a man.
Ji Wanqing is the only daughter of the Ji family. She has been engaged to the Zhang family since childhood.
However, the engagement does not affect the plot, and the two will not marry because of it.
This story focuses on case-solving and deduction. The author has many original ideas, and the cases progress according to objective logic.
However, the dynasty's customs and events are all the author's inventions. This story is not based on real history.
Theme: Good is rewarded with good.