ML growing up was disguised as a Princess so no one would try and kill him. No one knew he was truly a male until it was unveiled later on. So when the FL went back in time to when she was 13 yrs old people at this point still don’t know the ‘crown princess’ is a Prince, including the maid and FL Friends (hope this helps). I assume we’ll get to see the gender reveal much later on in the story.

I'm currently on chapter 6 and I can't understand what is going on..
In chapter 2 larriette's friends were talking about how handsome prince Rupert and is 15 yrs old and then in the next chapter larriette is asking her maid how old crown prince Rupert is and her nanny says that she is laffert crown Princess and is13 yrs old? I understand that Rupert dressed as a girl but I don't think her friends knew about it.. I don't know what's going on