Secret Identity

I am writing a dark fantasy novel where one of my main characters is actually the prince of the enemy and it's easily hidden in my part one. Part two reveals him to the reader and my other main character (f). I have two ways I have written his reveal. The first option is in the beginning of part two the reader will learn who he is when he reunites with his brother the king. Then later she is introduced to him by his brother, who doesn't know they know each other.

Option two is the reader and (f) finding out during the same introduction by his brother. For the past week I have been writing it as option one, but because his true identity is truly shocking to her enough I am leaning toward option two at the moment.

For context, this happens after she is reborn into the people of the enemy after being killed by the other MC on purpose. I also am trying to figure out if she loses her memory until she finds out who he is, or if she retains *most* of her memory and only after his reveal does she remember how she died.