There is a woman named Gong-joo. Perhaps it’s due to her parents’ unique philosophy. But, Gong-joo believes that she is a real princess. She hides her identity from the people around her. As she gets older, her dad tells Gong-joo the truth. Yet, Gong-joo gets pleased with the fact that she became a commoner, and she learns that a more beautiful place than the royal palace is where she actually lives now. More than the place, the love, and acceptance of people around her were truly valuable assets.