What if the woman doesn't return the bride price after breaking up?

Please don't say that losing the case means that the court tampered with it. The court is not a god, it can see through everything. The lawsuit is based on evidence. One party didn't issue a receipt, and the other party didn't admit it. You can only prove it through witnesses. It depends on the probative force of the witness testimony you can provide. The rules of judicial evidence in China strictly abide by the convention that physical evidence is greater than verbal evidence. It is indeed quite difficult for you to rely solely on the probative force of witness testimony, but if you can find enough witnesses or more convincing testimony, you may still win the case.