Fake Heir, Your True Gender Has Been Exposed!

In the Kingdom of Feiyu, Su Jinyun transmigrates into a book! She becomes a fake heir who was ordered by her father to dress as a boy from birth. In truth, she's a girl!

The Su family has many children, all boys, and Su Jinyun is the only girl.

Su Jinyun: Father! Your daughter doesn't want to manage the household! Your daughter doesn't even want to be the heir anymore! Your daughter wants to run away from home.

Su Jinyun: Daughter! You mustn't! You can't leave our home!

Su Qi: ...He thinks to himself, because the moment you leave home, you'll bind yourself to a System, and sooner or later your identity as a girl will be exposed!

Su Jinyun's destined match is Xiao Yinan, the eldest prince of the Southern Kingdom and son of its former empress. He now poses as a fallen prince, waiting for the right moment to reclaim the throne. Su Jinyun dresses as a man and knows everything about Xiao Yi's affairs. The System told her all about it, of course.