so...why is she hiding her gender?...I can't remember the reason why she is not telling hi...

i think its because she doesnt want him to feel betrayed idk

At first, she needed pretend to be a dude in order for the emperor not to go after her family. I think it kinda just stuck to her to continue pretending when she lost the chance to tell him

So now, you can say she is hiding it out of fear?

I'm thinking so