There's a neighbor who started giving expensive gifts to their child's homeroom teacher beginning in 10th grade. After each gift was given, the parent secretly kept records of the gifts. The teacher also took special care of the child. Three years later, the child got into college.

After the child went to university, the neighbor without hesitation took the gift records and directly reported the teacher to authorities. Because all the gifts were valuable items, the homeroom teacher was quickly fired; all gifts were returned, and for gifts already used, cash refunds were calculated based on original prices according to the receipts provided.

After the neighbor did this, other parents who had given gifts to the homeroom teacher rushed to report the teacher as well, demanding refunds for the gifts they had given. The common point among these parents was that their children had all already graduated.