In the first part of Princess Pearl, what did Wei Zi say in the horse's ear?

There is really no need to delve into this problem, landlord. Horses are human beings, and they can understand simple human commands, such as "run" and "stop". But here, if Wei Zi just patted the horse's head and said "run", this scene would be too boring, don't you think? So the director deliberately set the camera like this, just to show Wei Zi's gentleness, but what she said doesn't matter at all.