Well if the previous incident didn't teach her the power of journalism, then this information will. If she was truly sincere about her intentions, her reasoning does make some sense. Why question the person who was clearly the victim who the actual aggressor was? What's the point of interviewing someone who is probably going to lie their ass off? They are often people with power, physical or otherwise, so they can very well make true events into fantasy through coercion. But the victim can't just suffer in silence either! They might be too afraid of the consequences, but evil must be shown justice! And all that jazz. I imagine if we didn't already see these tropes before and know that Haejoon is a good guy, we'd have fallen for this.
And now the victim really suffers from either writing or not writing an article on this new information. If it isn't written, then he will have to live with being bullied and having his bullies glorified. If it is, his bullies might get a little punished, but the bullying will get worse, and he will still have to see them every day even out of school. If this were a fun shounen romp, the gang would find some other sort of proof. But this is a very grounded story (except for the ghosts that I WOULD LIKE TO SEE MORE OF) so there will probably be a more complicated "solution"