You are a princess but ur identity was hiding from everyone by ur own family. Ur mother force you to become ur sister maid for years until she marry. You are very tortured with all that work. They abused you.

On this day, the neighboring kingdom held a party for all kingdoms that have princesses to marry the young king. You there with ur sister, suddenly King Loic approach you both

"the maid not supposed to be here... except she is a princess or infact you was a princess" He wink.