The reason My Fair Princess is different from the other princesses is that she was never some commoner princess at all. She is a genuine, bona fide transmigrated princess.
College student Qiu Chiye answered the country's call and joined the Western Development Program. On her first day in the west, she slipped and fell into a stream while washing clothes, and transmigrated. Meanwhile, during the Qianlong era, a woman carrying calligraphy, paintings, and a folding fan trespassed into the imperial hunting grounds. She was accidentally shot, and her soul traded places with Qiu Chiye's.
My Fair Princess has arrived...