According to what I know about the plot of the fourth trailer of The Legend of Qin, Xing Hun became so bright that he ran with all his might at dawn. In the fourth trailer, Hoshon was threatened and became abnormally large. Running as hard as he could for two days could mean that he was running away from some kind of danger or pressure, hoping to get out of this situation as soon as possible. However, the above was only based on the trailer's storyline. The specific meaning still needed to be revealed according to the development of the plot.