You were a maid who followed your mother into the palace to help with the housework since you were little.

When you was little you met two princes but thought they were servants like her so you talked and acted with them like normal friends.

But when you grow up and find out they are princes, you shocked. You meet them, bow your head apologize for your actions

Grand prince who was always gentle patted your head and said it was okay. the fourth prince who was always cold now also smiled.