Did Yang Guo and Little Dragon Girl really exist in Song Dynasty?

It does not exist in history. The historical background of the Southern Song Dynasty and the Jin and Yuan Dynasties relied on the condor heroes.

The little dragon girl in history is called Wucheng Little Dragon Girl. She was one of the famous female ghosts in the Northern Song Dynasty, and was born a female Taoist. Born in Nanchang today, he wandered between Sichuan and Sichuan, and after his death, he surrendered the human demons, which is the prototype of the characters in Jin Yong's novels. Therefore, the records in the history of the Song Dynasty are all ghosts and gods in folklore, and his works include Jiang Ting Complain (also known as Jingzhou Pavilion):

Curtains rolled up and endless clouds appeared on the river. I haven't cleaned up my tears, and my home is in the middle of nowhere.

At what time, Sha Ou jumped up. When the poem was about to be finished, it disappeared into the smoke.

Because his ci was praised by Huang Tingjian, it spread all over the world (see Ci Zong, Ci Pu, Cold Zhai Night Talk).