C2151 Is She a Human or a Ghost

I don't know how long the car's been moving.

Suddenly, a child ran out from the roadside. That child ran too fast. Seeing that he was about to crash into Jun Yi's car, he was so scared that he kept stepping back. However, because he retreated too quickly, he fell backward when he reached the side of the road. He fell back into the ditch on the side of the road