The video was from a surveillance camera at an intersection.
It was first released by the traffic brigade's video account, and then various mainstream official media accounts also forwarded it, and within less than two hours, the video shot to the top spot on the trending search.
The initial trending search title was [A young girl dashes to save a little boy from being hit by a truck], which later changed to [The entire internet is looking for the girl who saved the little boy from under the truck].
Because that intersection was a more remote section of road, and the equipment had not been updated, the surveillance footage in the video was still in black and white.
By clicking in, you could see that first, a little boy suddenly ran into the middle of the road, then suddenly a white large truck came speeding, and when it violently braked, it couldn't stop at all.