Ling Yichen did not explain this. All the creatures from the other world who had crossed the spatial rift to Earth had been instilled with Chinese. This seemed to be a gift from the heavens. The reason why it was Chinese was probably because Chinese was the most widely-spoken language on Earth.
One language spoken by many people in a single country does not make it the most spoken language. The most widely used language throughout the world is English. Should have just said the language of the demons is dependent on the most widely used language in the region they arrived in.
Ling Yichen did not explain this. All the creatures from the other world who had crossed the spatial rift to Earth had been instilled with Chinese. This seemed to be a gift from the heavens. The reason why it was Chinese was probably because Chinese was the most widely-spoken language on Earth.
My Doomsday Bug Nest
Sci-fi · You In My Three Thousand Dreams