Cassandra is Rapunzel's lady-in-waiting and personal guard at the same time. The princess was meant to marry the crowned prince of the Dark Kingdom, Varian. Everyone in Corona knows how much the Princess loves her boyfriend, Eugene - even her parents knew of this but a deal is a deal. A war might start if it weren't fulfilled. Rapunzel was sent a month early to the particular kingdom with her lady-in-waiting by her side. Rapunzel wanted to spend the time she have left with Eugene so the ladies did something reckless. They switched. For a month, Cassandra would act as a princess while Rapunzel as a lady-in-waiting so she could sneak out to meet Eugene. They were going to reveal the truth after a month. It was all part of the plan. What if things don't go the way they expected it? It was supposed to be just a month and all pretend to Cassandra, but as days passed by, why is it that she could never get the prince out of her mind? It's a Once Upon A Switch love story.