The case should first be reviewed by the inspector. The behavior of A is caused or not, because of the application of the law. In addition to reviewing whether or not a negligence is not a pure or inaction, the court should, in addition to examining whether it is "should prevent" the guarantor's obligations, should also investigate whether A is "can prevent" and whether its results are "avoidable". recognize. If A is in the status of a guarantor, can it be foreseen and prevent the outcome from happening? Even if it is determined that A has not fulfilled its obligations, is there a causal relationship with the results? Does the result have "avoidability"? That is to say, whether the case is in line with the connotation of negligence and impureness.