They Say I Have Amnesia [Interstellar]

The moment I opened my eyes, I was surrounded by people calling me princess, with a tall, handsome, attentive fiancé looking after me. I thought I had transmigrated into someone else's body and was about to make up an excuse about having amnesia when I was told: "Princess, don't worry. You only suffered a head injury and lost your memory." Huh? I really did lose my memory?! (Not told in first person. I just haven't decided what to name the heroine...)