Why is Liu Yifei called Sister Fairy?

In Eight Dragons, Wang Yuyan, who is out of touch with the world, and Liu Yifei, who is young and pure, can perform well, and also won the exclusive title of "Fairy Sister" for Liu Yifei.

Liu Yifei is beautiful, pure, tall, oval, and the ancient costume is very elegant. Because she practiced dancing since she was a child, her gestures are quite classical. Liu Yifei didn't appear in many TV series, but from 2003 to 2006, he still created many classic characters.

Her out-of-touch temperament, coupled with the Wang Yuyan she played in the play, was called the fairy sister by Duan Yu, hence the name.