I'm not sure specifically which 'Gyeongseong Creature' you are referring to. There could be various fictional or local interpretations. It might be a creature from a specific cultural folktale in the Gyeongseong area. Without more context, it's difficult to provide a detailed full story.
The 'Gyeongseong Creature' real story might be related to the history and mythology of the region. It could be a story passed down through generations. It might involve a mysterious or magical creature that was believed to exist in Gyeongseong. Without more specific information, it's difficult to tell the exact story.
It's not based on a true story. The plot and characters of Gyeongseong Creature are created by the author's imagination to build an engaging fictional narrative.
I'm not entirely sure specifically what the 'gyeongseong creature true story' is. It could be a local or regional story about a particular creature in Gyeongseong. Maybe it's a mythical or real - life animal encounter story.