legal ground
Article 1024 of the Civil Code
The civil subject enjoys the right of reputation. No organization or individual may infringe upon the reputation right of others by insulting or slandering.
Reputation is a social evaluation of the moral character, reputation, talent and credit of civil subjects.
Article 165
If the actor infringes upon the civil rights and interests of others due to his fault, he shall bear the tort liability. If the actor is presumed to be at fault according to the law and cannot prove that he is not at fault, he shall bear tort liability.