Back then, stories about mythical creatures were derived from mythology, passed down from generation to generation and became part of culture. Nowadays, these mythical creatures are perceived more as a joke and are mostly forgotten.
The title Belis was taken from ancient Javanese language, meaning ghost or mythical creature. Why Java? because Java Island has the biggest ethnic subdivision out of many Islands in Indonesia, so it resulted the cultural development and also told to have the largest amount of mythical creatures.